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Secondary 3 Additional Mathematics Calculus Quiz

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Questions

Secondary 3 Additional Mathematics Quiz - Calculus

Name: ___________________________
Class: ___________________________
Date: ___________________________
Score: ________ / 50

Duration: 60 minutes
Total Marks: 50

Instructions:

Answer ALL questions.
Show all working clearly. Marks will be awarded for correct method even if the final answer is wrong.
Non-programmable scientific calculators may be used.
Give answers as exact values unless otherwise stated.
The number of marks for each question is shown in brackets [ ].

Section A: Differentiation (Questions 1–10)

Questions 1–5 are multiple choice. Shade the correct option on your answer sheet. Each question carries 2 marks.

1. Given that $y = 3x^4 - 2x^2 + 7$ , find $\frac{dy}{dx}$ .

A) $12x^3 - 4x$
B) $12x^3 - 4x + 7$
C) $3x^3 - 2x$
D) $12x^3 - 2x$

2. If $f(x) = (2x - 5)^3$ , find $f'(x)$ .

A) $3(2x - 5)^2$
B) $6(2x - 5)^2$
C) $2(2x - 5)^3$
D) $6(2x - 5)^3$

3. Given $y = \frac{x^2 + 1}{x}$ , find $\frac{dy}{dx}$ .

A) $1 - \frac{1}{x^2}$
B) $1 + \frac{1}{x^2}$
C) $2x - \frac{1}{x^2}$
D) $2x + \frac{1}{x^2}$

4. The equation of a curve is $y = x^3 - 6x^2 + 9x$ . At which point does the gradient equal zero?

A) $(1, 4)$ only
B) $(3, 0)$ only
C) $(1, 4)$ and $(3, 0)$
D) $(0, 0)$ and $(3, 0)$

5. A particle moves along a straight line such that its displacement, $s$ metres, from a fixed point $O$ at time $t$ seconds is given by $s = t^3 - 4t^2 + 2t$ . Find the velocity when $t = 3$ .

A) $5 \text{ m/s}$
B) $11 \text{ m/s}$
C) $-5 \text{ m/s}$
D) $3 \text{ m/s}$

Questions 6–10 are short-answer. Show your working clearly.

6. Differentiate each of the following with respect to $x$ :

(a) $y = 5x^3 - 4x + 3$

(b) $y = (3x + 2)(x - 4)$

7. Given $y = \sqrt{4x + 1}$ , find $\frac{dy}{dx}$ . Express your answer in surd form.

8. Find the gradient of the curve $y = 2x^3 - 5x^2 + 3x - 1$ at the point where $x = 2$ .

9. Given $f(x) = (x^2 - 3)^4$ , find $f'(1)$ .

10. A curve has equation $y = ax^3 + bx$ . The gradient of the curve at the point $(1, 5)$ is $8$ . Find the values of $a$ and $b$ .

Section B: Applications of Differentiation (Questions 11–15)

11. The equation of a curve is $y = x^3 - 6x^2 + 9x + 2$ .

(a) Find $\frac{dy}{dx}$ .

(b) Find the coordinates of the stationary points of the curve.

12. A rectangular enclosure is to be fenced using $120 \text{ m}$ of fencing. One side of the enclosure is along a wall and requires no fencing.

(a) If the side perpendicular to the wall has length $x$ metres, show that the area enclosed is $A = 120x - 2x^2$ .

(b) Find the value of $x$ that maximises the enclosed area.

13. The curve $y = x^3 + ax^2 + bx + c$ has a stationary point at $(2, -5)$ and passes through the point $(0, 3)$ . Find the values of $a$ , $b$ , and $c$ .

14. A particle moves in a straight line such that its displacement, $s$ metres, from the origin $O$ at time $t$ seconds is given by $s = 2t^3 - 15t^2 + 24t + 3$ , for $t \geq 0$ .

(a) Find an expression for the velocity $v$ of the particle at time $t$ .

(b) Find the times when the particle is instantaneously at rest.

15. The normal to the curve $y = x^2 - 4x + 7$ at the point $P(3, 4)$ meets the curve again at the point $Q$ . Find the coordinates of $Q$ .

Section C: Integration (Questions 16–20)

16. Find each of the following integrals:

(a) $\int (6x^2 - 4x + 1) \, dx$

(b) $\int (2x - 3)^2 \, dx$

17. Given that $\frac{dy}{dx} = 3x^2 - 6x + 2$ and that $y = 5$ when $x = 1$ , find $y$ in terms of $x$ .

18. Find the equation of the curve which passes through the point $(2, 10)$ and for which $\frac{dy}{dx} = 4x^3 - 6x$ .

19. The gradient of a curve at any point $(x, y)$ is given by $\frac{dy}{dx} = (x - 2)(x + 3)$ .

(a) Find the $x$ -coordinates of the stationary points of the curve.

(b) Given that the curve passes through the point $(1, 6)$ , find the equation of the curve.

20. The velocity of a particle travelling in a straight line is given by $v = 3t^2 - 12t + 9 \text{ m/s}$ , where $t \geq 0$ is the time in seconds.

(a) Given that the displacement $s = 5 \text{ m}$ when $t = 0$ , find an expression for $s$ in terms of $t$ .

(b) Find the displacement of the particle when $t = 3$ .

END OF QUIZ

Answers

Secondary 3 Additional Mathematics Quiz - Calculus

Answer Key

Section A: Differentiation (Questions 1–10)

1. A) $12x^3 - 4x$ [2]

Working: $\frac{dy}{dx} = 3(4)x^3 - 2(2)x = 12x^3 - 4x$ . The derivative of the constant $7$ is zero.

Common mistake: Choosing B — forgetting that the derivative of a constant is zero.

2. B) $6(2x - 5)^2$ [2]

Working: Using the chain rule: $f'(x) = 3(2x - 5)^2 \times 2 = 6(2x - 5)^2$ .

Common mistake: Choosing A — forgetting to multiply by the derivative of the inner function $(2x - 5)$ , which is $2$ .

3. A) $1 - \frac{1}{x^2}$ [2]

Working: Rewrite $y = \frac{x^2}{x} + \frac{1}{x} = x + x^{-1}$ . Then $\frac{dy}{dx} = 1 - x^{-2} = 1 - \frac{1}{x^2}$ .

Alternative: Using the quotient rule: $\frac{dy}{dx} = \frac{(2x)(x) - (x^2+1)(1)}{x^2} = \frac{2x^2 - x^2 - 1}{x^2} = \frac{x^2 - 1}{x^2} = 1 - \frac{1}{x^2}$ .

4. C) $(1, 4)$ and $(3, 0)$ [2]

Working: $\frac{dy}{dx} = 3x^2 - 12x + 9 = 3(x^2 - 4x + 3) = 3(x-1)(x-3)$ . Setting $\frac{dy}{dx} = 0$ : $x = 1$ or $x = 3$ . When $x = 1$ : $y = 1 - 6 + 9 = 4$ . When $x = 3$ : $y = 27 - 54 + 27 = 0$ . Points are $(1, 4)$ and $(3, 0)$ .

5. A) $5 \text{ m/s}$ [2]

Working: $v = \frac{ds}{dt} = 3t^2 - 8t + 2$ . When $t = 3$ : $v = 3(9) - 8(3) + 2 = 27 - 24 + 2 = 5 \text{ m/s}$ .

(a) $\frac{dy}{dx} = 15x^2 - 4$ [1]

Working: $\frac{d}{dx}(5x^3) - \frac{d}{dx}(4x) + \frac{d}{dx}(3) = 15x^2 - 4 + 0$ .

(b) $\frac{dy}{dx} = 6x - 10$ [2]

Working: First expand: $y = 3x^2 - 12x + 2x - 8 = 3x^2 - 10x - 8$ . Then $\frac{dy}{dx} = 6x - 10$ .

Alternative using product rule: $\frac{dy}{dx} = (3)(x-4) + (3x+2)(1) = 3x - 12 + 3x + 2 = 6x - 10$ .

Working: Rewrite $y = \frac{2x^3}{x^2} - \frac{1}{x^2} = 2x - x^{-2}$ . Then $\frac{dy}{dx} = 2 - (-2)x^{-3} = 2 + \frac{2}{x^3}$ .

7. $\frac{dy}{dx} = \frac{2}{\sqrt{4x+1}}$ [3]

Working: $y = (4x+1)^{1/2}$ . Using the chain rule: $\frac{dy}{dx} = \frac{1}{2}(4x+1)^{-1/2} \times 4 = \frac{2}{\sqrt{4x+1}}$ .

Marking: [1] for correct application of chain rule, [1] for correct simplification, [1] for final answer in surd form.

8. Gradient $= 3$ [3]

Working: $\frac{dy}{dx} = 6x^2 - 10x + 3$ . At $x = 2$ : $\frac{dy}{dx} = 6(4) - 10(2) + 3 = 24 - 20 + 3 = 7$ .

Correction: $\frac{dy}{dx} = 6(4) - 20 + 3 = 24 - 20 + 3 = 7$ .

Gradient $= 7$ [3]

Marking: [1] for correct differentiation, [1] for correct substitution, [1] for correct evaluation.

9. $f'(1) = -32$ [3]

Working: $f'(x) = 4(x^2 - 3)^3 \times 2x = 8x(x^2 - 3)^3$ . At $x = 1$ : $f'(1) = 8(1)(1 - 3)^3 = 8(-2)^3 = 8(-8) = -64$ .

Correction: $f'(1) = 8(1)(1-3)^3 = 8(1)(-8) = -64$ .

$f'(1) = -64$ [3]

Marking: [1] for correct chain rule application, [1] for correct substitution, [1] for correct evaluation.

10. $a = \frac{13}{2}$ , $b = -\frac{3}{2}$ [4]

Working: $y = ax^3 + bx$ , so $\frac{dy}{dx} = 3ax^2 + b$ . At $(1, 5)$ : $y = a(1)^3 + b(1) = a + b = 5$ … (i). Gradient: $3a(1)^2 + b = 3a + b = 8$ … (ii). Subtracting (i) from (ii): $2a = 3$ , so $a = \frac{3}{2}$ . From (i): $\frac{3}{2} + b = 5$ , so $b = \frac{7}{2}$ .

Correction: From (ii) − (i): $(3a + b) - (a + b) = 8 - 5 = 3$ , so $2a = 3$ , $a = \frac{3}{2}$ . Then $b = 5 - \frac{3}{2} = \frac{7}{2}$ .

$a = \frac{3}{2}$ , $b = \frac{7}{2}$ [4]

Marking: [1] for correct differentiation, [1] for forming equation from point on curve, [1] for forming equation from gradient, [1] for solving simultaneously.

Section B: Applications of Differentiation (Questions 11–15)

11.

(a) $\frac{dy}{dx} = 3x^2 - 12x + 9$ [1]

(b) Stationary points: $(1, 6)$ and $(3, 2)$ [3]

Working: Set $\frac{dy}{dx} = 0$ : $3x^2 - 12x + 9 = 0$ , so $x^2 - 4x + 3 = 0$ , giving $(x-1)(x-3) = 0$ , so $x = 1$ or $x = 3$ . When $x = 1$ : $y = 1 - 6 + 9 + 2 = 6$ . When $x = 3$ : $y = 27 - 54 + 27 + 2 = 2$ . Points are $(1, 6)$ and $(3, 2)$ .

Marking: [1] for solving $\frac{dy}{dx}=0$ , [1] for each correct point.

Working: $\frac{d^2y}{dx^2} = 6x - 12$ . At $x = 1$ : $\frac{d^2y}{dx^2} = 6 - 12 = -6 < 0$ , so maximum. At $x = 3$ : $\frac{d^2y}{dx^2} = 18 - 12 = 6 > 0$ , so minimum.

Marking: [1] for correct second derivative, [1] for correct nature at $x=1$ , [1] for correct nature at $x=3$ .

12.

(a) Shown. [2]

Working: Let the two sides perpendicular to the wall each have length $x$ and the side parallel to the wall have length $l$ . Then $l + 2x = 120$ , so $l = 120 - 2x$ . Area $A = l \times x = (120 - 2x)x = 120x - 2x^2$ .

Marking: [1] for correct expression for $l$ , [1] for correct area expression.

(b) $x = 30$ [2]

Working: $\frac{dA}{dx} = 120 - 4x$ . Set $\frac{dA}{dx} = 0$ : $120 - 4x = 0$ , so $x = 30$ . Check: $\frac{d^2A}{dx^2} = -4 < 0$ , confirming maximum.

Marking: [1] for differentiation and solving, [1] for confirming maximum.

Working: $A = 120(30) - 2(30)^2 = 3600 - 1800 = 1800$ .

13. $a = -3$ , $b = 0$ , $c = 3$ [5]

Working: $\frac{dy}{dx} = 3x^2 + 2ax + b$ . At stationary point $(2, -5)$ : $\frac{dy}{dx} = 0$ when $x = 2$ , so $3(4) + 2a(2) + b = 0$ , giving $12 + 4a + b = 0$ … (i). Also $y = -5$ when $x = 2$ : $8 + 4a + 2b + c = -5$ … (ii). The curve passes through $(0, 3)$ : $c = 3$ … (iii). From (iii) into (ii): $8 + 4a + 2b + 3 = -5$ , so $4a + 2b = -16$ , i.e. $2a + b = -8$ … (iv). From (i): $4a + b = -12$ … (i). Subtracting (iv) from (i): $2a = -4$ , so $a = -2$ . From (iv): $2(-2) + b = -8$ , so $b = -4$ .

Correction: From (i): $4a + b = -12$ . From (iv): $2a + b = -8$ . Subtracting: $2a = -4$ , so $a = -2$ . Then $b = -8 - 2(-2) = -8 + 4 = -4$ . And $c = 3$ .

$a = -2$ , $b = -4$ , $c = 3$ [5]

Marking: [1] for $\frac{dy}{dx}=0$ at $x=2$ , [1] for point $(2,-5)$ on curve, [1] for $c=3$ , [1] for solving for $a$ , [1] for solving for $b$ .

14.

(a) $v = 6t^2 - 30t + 24$ [1]

Working: $v = \frac{ds}{dt} = 6t^2 - 30t + 24$ .

(b) $t = 1$ and $t = 4$ [3]

Working: Set $v = 0$ : $6t^2 - 30t + 24 = 0$ , so $t^2 - 5t + 4 = 0$ , giving $(t-1)(t-4) = 0$ . So $t = 1$ or $t = 4$ .

Marking: [1] for setting $v=0$ , [1] for correct factorisation, [1] for both values.

Working: $a = \frac{dv}{dt} = 12t - 30$ . At $t = 2$ : $a = 24 - 30 = -6 \text{ m/s}^2$ .

Marking: [1] for correct differentiation, [1] for correct substitution.

15. $Q = \left(\frac{1}{2}, \frac{13}{4}\right)$ [5]

Working: $\frac{dy}{dx} = 2x - 4$ . At $x = 3$ : gradient of tangent $= 2(3) - 4 = 2$ . Gradient of normal $= -\frac{1}{2}$ . Equation of normal at $(3, 4)$ : $y - 4 = -\frac{1}{2}(x - 3)$ , so $y = -\frac{1}{2}x + \frac{3}{2} + 4 = -\frac{1}{2}x + \frac{11}{2}$ . To find intersection with curve: $x^2 - 4x + 7 = -\frac{1}{2}x + \frac{11}{2}$ . Multiply by 2: $2x^2 - 8x + 14 = -x + 11$ , so $2x^2 - 7x + 3 = 0$ . Factorise: $(2x - 1)(x - 3) = 0$ . So $x = 3$ (point $P$ ) or $x = \frac{1}{2}$ . When $x = \frac{1}{2}$ : $y = \frac{1}{4} - 2 + 7 = \frac{21}{4} = \frac{13}{4}$ ... Let me recalculate: $y = \left(\frac{1}{2}\right)^2 - 4\left(\frac{1}{2}\right) + 7 = \frac{1}{4} - 2 + 7 = \frac{1}{4} + 5 = \frac{21}{4}$ .

$Q = \left(\frac{1}{2}, \frac{21}{4}\right)$ [5]

Marking: [1] for gradient of tangent, [1] for gradient of normal, [1] for equation of normal, [1] for solving simultaneous equations, [1] for correct coordinates of $Q$ .

Section C: Integration (Questions 16–20)

16.

(a) $\int(6x^2 - 4x + 1)\,dx = 2x^3 - 2x^2 + x + c$ [2]

Marking: [1] for correct integration of each term, [1] for including constant of integration.

(b) $\int(2x-3)^2\,dx = \frac{(2x-3)^3}{6} + c$ (or expanded form) [2]

Working (substitution): Let $u = 2x - 3$ , $du = 2\,dx$ . $\int u^2 \cdot \frac{du}{2} = \frac{1}{2} \cdot \frac{u^3}{3} = \frac{(2x-3)^3}{6} + c$ .

Working (expansion): $(2x-3)^2 = 4x^2 - 12x + 9$ . $\int(4x^2 - 12x + 9)\,dx = \frac{4x^3}{3} - 6x^2 + 9x + c$ .

Marking: Either method accepted. [1] for correct method, [1] for correct answer with constant.

Working: $\frac{x^3-1}{x^2} = x - x^{-2}$ . $\int(x - x^{-2})\,dx = \frac{x^2}{2} - \frac{x^{-1}}{-1} + c = \frac{x^2}{2} + \frac{1}{x} + c$ .

Marking: [1] for correct simplification, [1] for correct integration with constant.

17. $y = x^3 - 3x^2 + 2x + 5$ [4]

Working: $y = \int(3x^2 - 6x + 2)\,dx = x^3 - 3x^2 + 2x + c$ . When $x = 1$ , $y = 5$ : $1 - 3 + 2 + c = 5$ , so $c = 5$ . Therefore $y = x^3 - 3x^2 + 2x + 5$ .

Marking: [1] for correct integration, [1] for including constant, [1] for correct substitution, [1] for correct value of $c$ and final expression.

18. $y = x^4 - 3x^2 + 2$ [4]

Working: $y = \int(4x^3 - 6x)\,dx = x^4 - 3x^2 + c$ . When $x = 2$ , $y = 10$ : $16 - 12 + c = 10$ , so $c = 6$ . Therefore $y = x^4 - 3x^2 + 6$ .

Correction: $16 - 12 + c = 10$ , so $4 + c = 10$ , $c = 6$ .

$y = x^4 - 3x^2 + 6$ [4]

Marking: [1] for correct integration, [1] for including constant, [1] for correct substitution, [1] for correct final equation.

19.

(a) $x = 2$ and $x = -3$ [2]

Working: At stationary points, $\frac{dy}{dx} = 0$ : $(x-2)(x+3) = 0$ , so $x = 2$ or $x = -3$ .

Marking: [1] for each correct value.

(b) $y = \frac{x^3}{3} + \frac{x^2}{2} - 6x + \frac{83}{6}$ [4]

Working: $y = \int(x^2 + x - 6)\,dx = \frac{x^3}{3} + \frac{x^2}{2} - 6x + c$ . When $x = 1$ , $y = 6$ : $\frac{1}{3} + \frac{1}{2} - 6 + c = 6$ . So $\frac{5}{6} - 6 + c = 6$ , giving $c = 6 + 6 - \frac{5}{6} = 12 - \frac{5}{6} = \frac{67}{6}$ .

Correction: $\frac{1}{3} + \frac{1}{2} = \frac{5}{6}$ . So $\frac{5}{6} - 6 + c = 6$ , meaning $c = 12 - \frac{5}{6} = \frac{72-5}{6} = \frac{67}{6}$ .

$y = \frac{x^3}{3} + \frac{x^2}{2} - 6x + \frac{67}{6}$ [4]

Marking: [1] for expanding the integrand, [1] for correct integration, [1] for correct substitution, [1] for correct final equation.

20.

(a) $s = t^3 - 6t^2 + 9t + 5$ [2]

Working: $s = \int(3t^2 - 12t + 9)\,dt = t^3 - 6t^2 + 9t + c$ . When $t = 0$ , $s = 5$ : $c = 5$ . So $s = t^3 - 6t^2 + 9t + 5$ .

Marking: [1] for correct integration with constant, [1] for correct value of $c$ .

(b) Displacement $= 5 \text{ m}$ [2]

Working: $s = 27 - 54 + 27 + 5 = 5 \text{ m}$ .

Marking: [1] for correct substitution, [1] for correct answer.

Working: $v = 3t^2 - 12t + 9 = 3(t^2 - 4t + 3) = 3(t-1)(t-3)$ . The velocity changes sign at $t = 1$ and $t = 3$ . For $0 < t < 1$ : $v > 0$ (particle moves forward). For $1 < t < 3$ : $v < 0$ (particle moves backward). For $3 < t < 4$ : $v > 0$ (particle moves forward). Displacement from $t = 0$ to $t = 1$ : $s(1) - s(0) = (1 - 6 + 9 + 5) - 5 = 9 - 5 = 4 \text{ m}$ . Displacement from $t = 1$ to $t = 3$ : $s(3) - s(1) = (27 - 54 + 27 + 5) - 9 = 5 - 9 = -4 \text{ m}$ (distance $= 4 \text{ m}$ ). Displacement from $t = 3$ to $t = 4$ : $s(4) - s(3) = (64 - 96 + 36 + 5) - 5 = 9 - 5 = 4 \text{ m}$ . Total distance $= 4 + 4 + 4 = 12 \text{ m}$ .

Marking: [1] for finding when $v = 0$ , [1] for determining sign changes/direction, [1] for calculating each stage of distance, [1] for correct total.

END OF ANSWER KEY

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