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A Level H1 Mathematics Algebra Functions Quiz

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Questions

A-Level Maths H1 Quiz - Algebra Functions

Name: __________________________
Class: __________________________
Date: __________________________
Score: ________ / 45

Duration: 60 minutes
Total Marks: 45
Instructions:

Answer all 20 questions.
You are expected to use an approved graphing calculator (GC).
Where numerical answers are required, give non-exact answers correct to 3 significant figures, unless otherwise stated.
Show necessary working clearly. Unsupported answers from a calculator are generally allowed, but you must show the mathematical steps where reasoning is required.

Section A: Basic Concepts and Manipulation (Questions 1–5)

Focus: Laws of indices, logarithms, and basic function definitions.

1. Solve the equation $3^{2x} - 10(3^x) + 9 = 0$ . [2]

2. Given that $\ln(x^2 y) = 3$ and $\ln(x y^2) = 4$ , find the exact values of $x$ and $y$ . [3]

3. The function $f$ is defined by $f(x) = e^{2x} - 5$ , for $x \in \mathbb{R}$ . (a) Find the inverse function $f^{-1}(x)$ and state its domain. [2] (b) Sketch the graph of $y = f^{-1}(x)$ , indicating any asymptotes and intercepts with the axes. [2]

4. Simplify the expression $\frac{e^{3x} \cdot e^{-x}}{(e^x)^2}$ , giving your answer in the form $e^{kx}$ . [1]

5. Solve the inequality $\ln(2x - 1) \leq 2$ . Give your answer in exact form. [2]

Section B: Graphs and Transformations (Questions 6–10)

Focus: Sketching, asymptotes, and transformations of exponential and logarithmic functions.

6. The diagram below shows the graph of $y = f(x)$ , where $f(x) = \ln(x)$ . (Note: Imagine a standard ln(x) graph passing through (1,0) with vertical asymptote x=0) On the same axes, sketch the graph of $y = 2 - \ln(x+1)$ . Clearly label: (i) The equation of the vertical asymptote. (ii) The coordinates of the x-intercept. (iii) The coordinates of the point corresponding to $(e, 1)$ on the original graph. [3]

7. Consider the function $g(x) = 3e^{-x} + 2$ . (a) State the equation of the horizontal asymptote. [1] (b) Find the exact value of $x$ for which $g(x) = 5$ . [2]

8. The curve $C$ has equation $y = e^{2x} - 4e^x + 3$ . (a) Find the coordinates of the points where $C$ crosses the x-axis. [2] (b) Find the coordinates of the stationary point on $C$ and determine its nature. [3]

9. Explain why the equation $e^x = -2$ has no real solutions. [1]

10. The function $h(x)$ is defined by $h(x) = |\ln(x)|$ . (a) Sketch the graph of $y = h(x)$ for $0 < x \leq 5$ . [2] (b) Hence, state the number of solutions to the equation $|\ln(x)| = 0.5$ . [1]

Section C: Applications and Modelling (Questions 11–15)

Focus: Exponential growth/decay, linearization, and context-based problems.

11. The population $P$ of a town $t$ years after 2020 is modelled by the equation $P = P_0 e^{kt}$ , where $P_0$ and $k$ are constants. In 2020, the population was 50,000. In 2025, the population was 62,000. (a) Find the value of $k$ correct to 3 significant figures. [2] (b) Estimate the population in 2030. [1]

12. The value $V$ of a car $t$ years after purchase is given by $V = A e^{-bt}$ . (a) Show that $\ln V$ is a linear function of $t$ . [1] (b) A plot of $\ln V$ against $t$ yields a straight line with gradient $-0.15$ and vertical intercept $9.2$ . Find the values of $A$ and $b$ . [2]

13. A radioactive substance decays such that its mass $m$ grams at time $t$ hours is given by $m = 50(0.8)^t$ . (a) Calculate the initial mass. [1] (b) Find the time taken for the mass to halve. [2]

14. The temperature $T$ of a cup of coffee $t$ minutes after being poured is modelled by $T = 20 + 60e^{-0.05t}$ . (a) What is the room temperature according to this model? [1] (b) Find the rate of change of the temperature when $t = 10$ minutes. [2]

15. Solve the simultaneous equations: $y = e^x$ $y = 4e^{-x}$ Give your answers in exact form. [3]

Section D: Advanced Algebraic Techniques (Questions 16–20)

Focus: Composite functions, domain/range implications (conceptual), and harder equations.

16. Let $f(x) = e^x$ for $x \in \mathbb{R}$ and $g(x) = \ln(x-2)$ for $x > 2$ . (a) Find the composite function $fg(x)$ in its simplest form. [2] (b) State the domain of $fg(x)$ . [1]

17. Solve the equation $2\ln(x) - \ln(x+3) = \ln(2)$ . Check for extraneous roots. [3]

18. The function $f(x) = \frac{e^x}{e^x + 1}$ . (a) Show that $f(x)$ can be written as $1 - \frac{1}{e^x + 1}$ . [1] (b) Hence, find the range of $f(x)$ . [2]

19. Given that $x = \log_2(y)$ , express $y$ in terms of $x$ and hence solve $2^{2x} - 5(2^x) + 4 = 0$ . [3]

20. A bacteria culture grows according to the law $N = N_0 e^{rt}$ . If the culture doubles every 3 hours, find the value of $r$ in the form $\frac{\ln a}{b}$ . [2]

Answers

A-Level Maths H1 Quiz - Algebra Functions (Answer Key)

1. Solve $3^{2x} - 10(3^x) + 9 = 0$ . [2] Let $u = 3^x$ . Then $u^2 - 10u + 9 = 0$ . $(u-9)(u-1) = 0$ . $u = 9$ or $u = 1$ . If $3^x = 9$ , then $x = 2$ . If $3^x = 1$ , then $x = 0$ . Answer: $x = 0, x = 2$ .

2. Given $\ln(x^2 y) = 3$ and $\ln(x y^2) = 4$ . [3] $2\ln x + \ln y = 3$ --- (1) $\ln x + 2\ln y = 4$ --- (2) From (1), $\ln y = 3 - 2\ln x$ . Substitute into (2): $\ln x + 2(3 - 2\ln x) = 4$ $\ln x + 6 - 4\ln x = 4$ $-3\ln x = -2 \implies \ln x = \frac{2}{3} \implies x = e^{2/3}$ . $\ln y = 3 - 2(\frac{2}{3}) = 3 - \frac{4}{3} = \frac{5}{3} \implies y = e^{5/3}$ . Answer: $x = e^{2/3}, y = e^{5/3}$ .

3. $f(x) = e^{2x} - 5$ . [4] (a) Let $y = e^{2x} - 5$ . Swap $x$ and $y$ : $x = e^{2y} - 5$ . $x + 5 = e^{2y} \implies \ln(x+5) = 2y \implies y = \frac{1}{2}\ln(x+5)$ . Domain of $f^{-1}$ : Argument of log must be positive. $x+5 > 0 \implies x > -5$ . Answer: $f^{-1}(x) = \frac{1}{2}\ln(x+5)$ , Domain: $x > -5$ .

(b) Graph of $y = \frac{1}{2}\ln(x+5)$ . Vertical Asymptote: $x = -5$ . x-intercept: $y=0 \implies \ln(x+5)=0 \implies x+5=1 \implies x=-4$ . Point $(-4, 0)$ . y-intercept: $x=0 \implies y = \frac{1}{2}\ln(5) \approx 0.8$ . Point $(0, \frac{1}{2}\ln 5)$ . Shape: Increasing logarithmic curve shifted left by 5 and scaled vertically by 0.5.

4. Simplify $\frac{e^{3x} \cdot e^{-x}}{(e^x)^2}$ . [1] Numerator: $e^{3x-x} = e^{2x}$ . Denominator: $e^{2x}$ . Result: $\frac{e^{2x}}{e^{2x}} = 1 = e^0$ . Answer: $1$ (or $e^{0x}$ ).

5. Solve $\ln(2x - 1) \leq 2$ . [2] Domain condition: $2x - 1 > 0 \implies x > 0.5$ . Exponentiate both sides: $2x - 1 \leq e^2$ . $2x \leq e^2 + 1$ . $x \leq \frac{e^2 + 1}{2}$ . Combining with domain: Answer: $0.5 < x \leq \frac{e^2 + 1}{2}$ .

6. Sketch $y = 2 - \ln(x+1)$ . [3] Original: $y=\ln x$ . Transformations: Shift left 1 unit ( $\ln(x+1)$ ), Reflect in x-axis ( $-\ln(x+1)$ ), Shift up 2 units ( $2-\ln(x+1)$ ). (i) Vertical Asymptote: $x = -1$ (since argument $x+1=0$ ). (ii) x-intercept: $0 = 2 - \ln(x+1) \implies \ln(x+1)=2 \implies x+1=e^2 \implies x=e^2-1$ . Point $(e^2-1, 0)$ . (iii) Point corresponding to $(e,1)$ on $\ln x$ : On $\ln(x+1)$ , input $x$ such that $x+1=e \implies x=e-1$ . Value is $\ln(e)=1$ . Reflect: $-1$ . Shift up 2: $-1+2=1$ . Point is $(e-1, 1)$ . Answer: Sketch showing VA at $x=-1$ , passing through $(e^2-1, 0)$ and $(e-1, 1)$ , decreasing curve.

7. $g(x) = 3e^{-x} + 2$ . [3] (a) As $x \to \infty$ , $e^{-x} \to 0$ . So $y \to 2$ . Answer: $y = 2$ . (b) $5 = 3e^{-x} + 2 \implies 3 = 3e^{-x} \implies 1 = e^{-x} \implies -x = \ln 1 = 0 \implies x = 0$ . Answer: $x = 0$ .

8. $y = e^{2x} - 4e^x + 3$ . [5] (a) x-intercepts: $y=0$ . Let $u=e^x$ . $u^2 - 4u + 3 = 0 \implies (u-3)(u-1)=0$ . $e^x = 3 \implies x = \ln 3$ . $e^x = 1 \implies x = 0$ . Points: $(0, 0)$ and $(\ln 3, 0)$ . (b) Stationary point: $\frac{dy}{dx} = 2e^{2x} - 4e^x$ . Set $\frac{dy}{dx} = 0 \implies 2e^x(e^x - 2) = 0$ . Since $e^x \neq 0$ , $e^x = 2 \implies x = \ln 2$ . y-coordinate: $y = e^{2\ln 2} - 4e^{\ln 2} + 3 = (e^{\ln 2})^2 - 4(2) + 3 = 2^2 - 8 + 3 = 4 - 8 + 3 = -1$ . Point: $(\ln 2, -1)$ . Nature: $\frac{d^2y}{dx^2} = 4e^{2x} - 4e^x$ . At $x=\ln 2$ : $4(4) - 4(2) = 16 - 8 = 8 > 0$ . Minimum. Answer: Min at $(\ln 2, -1)$ .

9. Why $e^x = -2$ has no real solutions. [1] Answer: The exponential function $e^x$ is strictly positive for all real $x$ ( $e^x > 0$ ). It can never equal a negative number.

10. $h(x) = |\ln(x)|$ . [3] (a) Sketch: For $x \geq 1$ , $y=\ln x$ . For $0 < x < 1$ , $y=-\ln x$ (reflection of the negative part of ln x above x-axis). V-shape touching x-axis at $(1,0)$ . VA at $x=0$ . (b) $|\ln x| = 0.5$ . Two branches. $\ln x = 0.5 \implies x=e^{0.5}$ and $\ln x = -0.5 \implies x=e^{-0.5}$ . Answer: 2 solutions.

11. Population Model $P = P_0 e^{kt}$ . [3] (a) $t=0, P=50000 \implies P_0 = 50000$ . $t=5, P=62000 \implies 62000 = 50000 e^{5k}$ . $1.24 = e^{5k} \implies \ln(1.24) = 5k \implies k = \frac{\ln(1.24)}{5} \approx 0.0431$ . Answer: $k \approx 0.0431$ . (b) $t=10$ (2030). $P = 50000 e^{10(0.0431)} = 50000 e^{0.431} \approx 50000(1.5388) \approx 76940$ . Alternatively, $P = 50000 (1.24)^2 = 50000(1.5376) = 76880$ . (Using exact k gives ~76942). Answer: approx 76,900.

12. Car Value $V = A e^{-bt}$ . [3] (a) $\ln V = \ln(A e^{-bt}) = \ln A + \ln(e^{-bt}) = \ln A - bt$ . This is linear form $Y = C + mX$ with $Y=\ln V, X=t$ . (b) Gradient $m = -b = -0.15 \implies b = 0.15$ . Intercept $C = \ln A = 9.2 \implies A = e^{9.2} \approx 9897$ . Answer: $A = e^{9.2}$ (or 9900), $b = 0.15$ .

13. Radioactive Decay $m = 50(0.8)^t$ . [3] (a) Initial mass at $t=0$ : $m = 50(0.8)^0 = 50$ g. Answer: 50 g. (b) Half mass = 25 g. $25 = 50(0.8)^t \implies 0.5 = 0.8^t$ . $\ln(0.5) = t \ln(0.8) \implies t = \frac{\ln 0.5}{\ln 0.8} \approx 3.106$ . Answer: 3.11 hours.

14. Coffee Temperature $T = 20 + 60e^{-0.05t}$ . [3] (a) Room temp is the asymptote as $t \to \infty$ . $T \to 20$ . Answer: $20^\circ$ C. (b) Rate of change $\frac{dT}{dt} = 60(-0.05)e^{-0.05t} = -3e^{-0.05t}$ . At $t=10$ : $\frac{dT}{dt} = -3e^{-0.5} \approx -3(0.6065) \approx -1.82$ . Answer: $-1.82^\circ$ C/min.

15. Simultaneous: $y = e^x$ and $y = 4e^{-x}$ . [3] $e^x = 4e^{-x} \implies e^x \cdot e^x = 4 \implies e^{2x} = 4$ . $2x = \ln 4 \implies x = \frac{1}{2}\ln 4 = \ln(4^{1/2}) = \ln 2$ . $y = e^{\ln 2} = 2$ . Answer: $x = \ln 2, y = 2$ .

16. $f(x) = e^x, g(x) = \ln(x-2)$ . [3] (a) $fg(x) = f(g(x)) = e^{\ln(x-2)}$ . Since $e^{\ln u} = u$ , $fg(x) = x - 2$ . Answer: $x - 2$ . (b) Domain of $g$ is $x > 2$ . Range of $g$ is $\mathbb{R}$ , which is domain of $f$ . So domain of $fg$ is domain of $g$ . Answer: $x > 2$ .

17. $2\ln(x) - \ln(x+3) = \ln(2)$ . [3] $\ln(x^2) - \ln(x+3) = \ln(2)$ . $\ln\left(\frac{x^2}{x+3}\right) = \ln(2)$ . $\frac{x^2}{x+3} = 2 \implies x^2 = 2(x+3) \implies x^2 - 2x - 6 = 0$ . $x = \frac{2 \pm \sqrt{4 - 4(1)(-6)}}{2} = \frac{2 \pm \sqrt{28}}{2} = 1 \pm \sqrt{7}$ . Check validity: Argument of log must be positive. $x > 0$ and $x+3 > 0 \implies x > 0$ . $1 - \sqrt{7} \approx -1.65$ (Reject). $1 + \sqrt{7} \approx 3.65$ (Accept). Answer: $x = 1 + \sqrt{7}$ .

18. $f(x) = \frac{e^x}{e^x + 1}$ . [3] (a) $\frac{e^x}{e^x+1} = \frac{e^x+1-1}{e^x+1} = \frac{e^x+1}{e^x+1} - \frac{1}{e^x+1} = 1 - \frac{1}{e^x+1}$ . Shown. (b) Range: $e^x > 0 \implies e^x + 1 > 1$ . $0 < \frac{1}{e^x+1} < 1$ . $-1 < -\frac{1}{e^x+1} < 0$ . $0 < 1 - \frac{1}{e^x+1} < 1$ . Answer: $0 < f(x) < 1$ .

19. $x = \log_2(y) \implies y = 2^x$ . [3] Equation: $2^{2x} - 5(2^x) + 4 = 0$ . Let $u = 2^x$ . $u^2 - 5u + 4 = 0$ . $(u-4)(u-1) = 0$ . $u=4 \implies 2^x=4 \implies x=2$ . $u=1 \implies 2^x=1 \implies x=0$ . Answer: $x=0, x=2$ .

20. Doubling time 3 hours. $N = N_0 e^{rt}$ . [2] $2N_0 = N_0 e^{r(3)} \implies 2 = e^{3r}$ . $\ln 2 = 3r \implies r = \frac{\ln 2}{3}$ . Answer: $r = \frac{\ln 2}{3}$ .