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Secondary 3 Additional Mathematics Vectors Matrices Quiz

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Secondary 3 Additional Mathematics Quiz - Vectors Matrices

Name: __________________________
Class: __________________________
Date: __________________________
Score: _________ / 60

Duration: 60 Minutes
Total Marks: 60

Instructions:

Answer all questions.
Show all necessary working clearly. No marks will be given for correct answers without working.
Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place in the case of angles in degrees, unless a different level of accuracy is specified in the question.
The use of an approved scientific calculator is expected, where appropriate.

Section A: Vector Algebra and Geometry (Questions 1–8)

1. The position vectors of points $A$ and $B$ relative to an origin $O$ are $\mathbf{a} = \begin{pmatrix} 2 \\ -1 \end{pmatrix}$ and $\mathbf{b} = \begin{pmatrix} 4 \\ 5 \end{pmatrix}$ . (a) Find the vector $\vec{AB}$ in column vector form. [1] (b) Calculate the magnitude of $\vec{AB}$ . [2]

2. Given vectors $\mathbf{u} = 3\mathbf{i} - 2\mathbf{j}$ and $\mathbf{v} = -\mathbf{i} + 4\mathbf{j}$ . Find the vector $\mathbf{w} = 2\mathbf{u} - 3\mathbf{v}$ in the form $p\mathbf{i} + q\mathbf{j}$ . [2]

3. Points $P, Q,$ and $R$ have position vectors $\mathbf{p} = \begin{pmatrix} 1 \\ 2 \end{pmatrix}$ , $\mathbf{q} = \begin{pmatrix} 4 \\ 6 \end{pmatrix}$ , and $\mathbf{r} = \begin{pmatrix} 7 \\ 10 \end{pmatrix}$ . Show that $P, Q,$ and $R$ are collinear. [3]

4. In triangle $OAB$ , $\vec{OA} = \mathbf{a}$ and $\vec{OB} = \mathbf{b}$ . Point $M$ is the midpoint of $AB$ . Express $\vec{OM}$ in terms of $\mathbf{a}$ and $\mathbf{b}$ . [2]

5. A vector $\mathbf{v} = \begin{pmatrix} 5 \\ k \end{pmatrix}$ has a magnitude of $\sqrt{41}$ . Given that $k > 0$ , find the value of $k$ . [2]

6. The vertices of a parallelogram $ABCD$ are $A(1, 2)$ , $B(4, 5)$ , and $C(6, 1)$ . Find the coordinates of vertex $D$ . [3]

7. Given that $\mathbf{a} = \begin{pmatrix} 3 \\ -1 \end{pmatrix}$ and $\mathbf{b} = \begin{pmatrix} 2 \\ 4 \end{pmatrix}$ . (a) Calculate the scalar product $\mathbf{a} \cdot \mathbf{b}$ . [1] (b) Hence, or otherwise, determine if $\mathbf{a}$ and $\mathbf{b}$ are perpendicular. Justify your answer. [1]

8. Point $P$ divides the line segment $AB$ internally in the ratio $2:3$ . If the position vectors of $A$ and $B$ are $\mathbf{a}$ and $\mathbf{b}$ respectively, express the position vector of $P$ in terms of $\mathbf{a}$ and $\mathbf{b}$ . [2]

Section B: Matrix Operations and Properties (Questions 9–14)

9. Given matrices $A = \begin{pmatrix} 2 & -1 \\ 0 & 3 \end{pmatrix}$ and $B = \begin{pmatrix} 1 & 4 \\ -2 & 1 \end{pmatrix}$ . Calculate the matrix $2A - B$ . [3]

10. Let $M = \begin{pmatrix} 3 & 1 \\ 2 & k \end{pmatrix}$ . Find the value of $k$ such that the determinant of $M$ is equal to 10. [2]

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11. Given $X = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$ and $Y = \begin{pmatrix} 0 & 1 \\ -1 & 2 \end{pmatrix}$ . (a) Find the product $XY$ . [2] (b) Find the product $YX$ . [2] (c) State whether matrix multiplication is commutative based on your results. [1]

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12. Find the inverse of the matrix $A = \begin{pmatrix} 4 & 3 \\ 2 & 1 \end{pmatrix}$ . [3]

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13. Solve the following simultaneous equations using the matrix method: $\begin{cases} 3x + 2y = 12 \\ x - y = 1 \end{cases}$ [4]

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14. Given that $A = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$ and $B = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}$ . Verify that $B^2 = A$ . [2]

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Section C: Transformations and Applications (Questions 15–20)

15. A transformation $T$ is represented by the matrix $\mathbf{M} = \begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ . (a) Describe the geometric transformation represented by $\mathbf{M}$ . [2] (b) Find the image of the point $(3, 4)$ under this transformation. [2]

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16. The matrix $\mathbf{P} = \begin{pmatrix} 2 & 0 \\ 0 & 2 \end{pmatrix}$ represents an enlargement. (a) State the scale factor of the enlargement. [1] (b) State the centre of the enlargement. [1] (c) Calculate the area of the image of a triangle with area $5 \text{ cm}^2$ under this transformation. [2]

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17. A rectangle has vertices at $(0,0), (2,0), (2,1),$ and $(0,1)$ . It is transformed by the matrix $\mathbf{T} = \begin{pmatrix} 3 & 1 \\ 0 & 1 \end{pmatrix}$ . (a) Find the coordinates of the vertices of the image. [3] (b) Calculate the area of the image. [2]

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18. Given matrices $A = \begin{pmatrix} 2 & 1 \\ 1 & 1 \end{pmatrix}$ and $B = \begin{pmatrix} 1 & -1 \\ -1 & 2 \end{pmatrix}$ . Show that $B$ is the inverse of $A$ by calculating $AB$ . [3]

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19. The position vectors of points $A$ and $B$ are $\mathbf{a} = 2\mathbf{i} + \mathbf{j}$ and $\mathbf{b} = 4\mathbf{i} - 3\mathbf{j}$ . Find the unit vector in the direction of $\vec{AB}$ . [3]

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20. Consider the system of linear equations: $\begin{cases} 2x + ky = 6 \\ 4x + 6y = 12 \end{cases}$ Find the value of $k$ for which the system has no unique solution. [3]

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*** End of Quiz ***

Answers

Secondary 3 Additional Mathematics Quiz - Vectors Matrices (Answer Key)

1. (a) $\vec{AB} = \mathbf{b} - \mathbf{a} = \begin{pmatrix} 4 \\ 5 \end{pmatrix} - \begin{pmatrix} 2 \\ -1 \end{pmatrix} = \begin{pmatrix} 2 \\ 6 \end{pmatrix}$ [1] (b) $|\vec{AB}| = \sqrt{2^2 + 6^2} = \sqrt{4 + 36} = \sqrt{40} = 2\sqrt{10}$ (or approx 6.32) [2]

2. $\mathbf{w} = 2(3\mathbf{i} - 2\mathbf{j}) - 3(-\mathbf{i} + 4\mathbf{j})$ $= (6\mathbf{i} - 4\mathbf{j}) - (-3\mathbf{i} + 12\mathbf{j})$ $= (6+3)\mathbf{i} + (-4-12)\mathbf{j}$ $= 9\mathbf{i} - 16\mathbf{j}$ [2]

3. $\vec{PQ} = \mathbf{q} - \mathbf{p} = \begin{pmatrix} 4-1 \\ 6-2 \end{pmatrix} = \begin{pmatrix} 3 \\ 4 \end{pmatrix}$ $\vec{QR} = \mathbf{r} - \mathbf{q} = \begin{pmatrix} 7-4 \\ 10-6 \end{pmatrix} = \begin{pmatrix} 3 \\ 4 \end{pmatrix}$ Since $\vec{PQ} = \vec{QR}$ , the vectors are parallel and share a common point $Q$ . Therefore, $P, Q, R$ are collinear. [3]

4. $\vec{OM} = \vec{OA} + \vec{AM} = \vec{OA} + \frac{1}{2}\vec{AB}$ $\vec{AB} = \mathbf{b} - \mathbf{a}$ $\vec{OM} = \mathbf{a} + \frac{1}{2}(\mathbf{b} - \mathbf{a}) = \mathbf{a} + \frac{1}{2}\mathbf{b} - \frac{1}{2}\mathbf{a} = \frac{1}{2}\mathbf{a} + \frac{1}{2}\mathbf{b}$ Alternatively, using midpoint formula: $\frac{\mathbf{a} + \mathbf{b}}{2}$ . [2]

5. $|\mathbf{v}| = \sqrt{5^2 + k^2} = \sqrt{41}$ $25 + k^2 = 41$ $k^2 = 16$ $k = \pm 4$ . Since $k > 0$ , $k = 4$ . [2]

6. In a parallelogram, $\vec{AB} = \vec{DC}$ . $\vec{AB} = \begin{pmatrix} 4-1 \\ 5-2 \end{pmatrix} = \begin{pmatrix} 3 \\ 3 \end{pmatrix}$ Let $D = (x, y)$ . Then $\vec{DC} = \begin{pmatrix} 6-x \\ 1-y \end{pmatrix}$ . $\begin{pmatrix} 3 \\ 3 \end{pmatrix} = \begin{pmatrix} 6-x \\ 1-y \end{pmatrix}$ $3 = 6-x \Rightarrow x = 3$ $3 = 1-y \Rightarrow y = -2$ Coordinates of $D$ are $(3, -2)$ . [3]

7. (a) $\mathbf{a} \cdot \mathbf{b} = (3)(2) + (-1)(4) = 6 - 4 = 2$ . [1] (b) Since $\mathbf{a} \cdot \mathbf{b} = 2 \neq 0$ , the vectors are not perpendicular. [1]

8. Using the section formula: $\mathbf{p} = \frac{3\mathbf{a} + 2\mathbf{b}}{2+3} = \frac{3\mathbf{a} + 2\mathbf{b}}{5}$ or $\frac{3}{5}\mathbf{a} + \frac{2}{5}\mathbf{b}$ . [2]

9. $2A = \begin{pmatrix} 4 & -2 \\ 0 & 6 \end{pmatrix}$ $2A - B = \begin{pmatrix} 4 & -2 \\ 0 & 6 \end{pmatrix} - \begin{pmatrix} 1 & 4 \\ -2 & 1 \end{pmatrix} = \begin{pmatrix} 4-1 & -2-4 \\ 0-(-2) & 6-1 \end{pmatrix} = \begin{pmatrix} 3 & -6 \\ 2 & 5 \end{pmatrix}$ . [3]

10. $\det(M) = (3)(k) - (1)(2) = 3k - 2$ . $3k - 2 = 10$ $3k = 12$ $k = 4$ . [2]

11. (a) $XY = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix} \begin{pmatrix} 0 & 1 \\ -1 & 2 \end{pmatrix} = \begin{pmatrix} (1)(0)+(2)(-1) & (1)(1)+(2)(2) \\ (3)(0)+(4)(-1) & (3)(1)+(4)(2) \end{pmatrix} = \begin{pmatrix} -2 & 5 \\ -4 & 11 \end{pmatrix}$ . [2] (b) $YX = \begin{pmatrix} 0 & 1 \\ -1 & 2 \end{pmatrix} \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix} = \begin{pmatrix} (0)(1)+(1)(3) & (0)(2)+(1)(4) \\ (-1)(1)+(2)(3) & (-1)(2)+(2)(4) \end{pmatrix} = \begin{pmatrix} 3 & 4 \\ 5 & 6 \end{pmatrix}$ . [2] (c) No, matrix multiplication is not commutative ( $XY \neq YX$ ). [1]

12. $\det(A) = (4)(1) - (3)(2) = 4 - 6 = -2$ . $A^{-1} = \frac{1}{-2} \begin{pmatrix} 1 & -3 \\ -2 & 4 \end{pmatrix} = \begin{pmatrix} -1/2 & 3/2 \\ 1 & -2 \end{pmatrix}$ . [3]

13. Matrix form: $\begin{pmatrix} 3 & 2 \\ 1 & -1 \end{pmatrix} \begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix} 12 \\ 1 \end{pmatrix}$ . $\det = (3)(-1) - (2)(1) = -5$ . Inverse: $\frac{1}{-5} \begin{pmatrix} -1 & -2 \\ -1 & 3 \end{pmatrix} = \frac{1}{5} \begin{pmatrix} 1 & 2 \\ 1 & -3 \end{pmatrix}$ . $\begin{pmatrix} x \\ y \end{pmatrix} = \frac{1}{5} \begin{pmatrix} 1 & 2 \\ 1 & -3 \end{pmatrix} \begin{pmatrix} 12 \\ 1 \end{pmatrix} = \frac{1}{5} \begin{pmatrix} 12+2 \\ 12-3 \end{pmatrix} = \frac{1}{5} \begin{pmatrix} 14 \\ 9 \end{pmatrix}$ . $x = \frac{14}{5} = 2.8$ , $y = \frac{9}{5} = 1.8$ . [4]

14. $B^2 = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix} \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix} = \begin{pmatrix} (0)(0)+(1)(1) & (0)(1)+(1)(0) \\ (1)(0)+(0)(1) & (1)(1)+(0)(0) \end{pmatrix} = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix} = A$ . [2]

15. (a) Rotation $90^\circ$ anti-clockwise about the origin. [2] (b) $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix} \begin{pmatrix} 3 \\ 4 \end{pmatrix} = \begin{pmatrix} -4 \\ 3 \end{pmatrix}$ . Image is $(-4, 3)$ . [2]

16. (a) Scale factor $k = 2$ . [1] (b) Centre $(0,0)$ . [1] (c) Area scale factor is $k^2 = 2^2 = 4$ . New Area $= 4 \times 5 = 20 \text{ cm}^2$ . [2]

17. (a) Vertices: $(0,0) \to \begin{pmatrix} 3 & 1 \\ 0 & 1 \end{pmatrix} \begin{pmatrix} 0 \\ 0 \end{pmatrix} = \begin{pmatrix} 0 \\ 0 \end{pmatrix}$ $(2,0) \to \begin{pmatrix} 3 & 1 \\ 0 & 1 \end{pmatrix} \begin{pmatrix} 2 \\ 0 \end{pmatrix} = \begin{pmatrix} 6 \\ 0 \end{pmatrix}$ $(2,1) \to \begin{pmatrix} 3 & 1 \\ 0 & 1 \end{pmatrix} \begin{pmatrix} 2 \\ 1 \end{pmatrix} = \begin{pmatrix} 7 \\ 1 \end{pmatrix}$ $(0,1) \to \begin{pmatrix} 3 & 1 \\ 0 & 1 \end{pmatrix} \begin{pmatrix} 0 \\ 1 \end{pmatrix} = \begin{pmatrix} 1 \\ 1 \end{pmatrix}$ Vertices: $(0,0), (6,0), (7,1), (1,1)$ . [3] (b) Determinant of $\mathbf{T} = (3)(1) - (1)(0) = 3$ . Original Area $= 2 \times 1 = 2$ . Image Area $= 3 \times 2 = 6$ square units. [2]

18. $AB = \begin{pmatrix} 2 & 1 \\ 1 & 1 \end{pmatrix} \begin{pmatrix} 1 & -1 \\ -1 & 2 \end{pmatrix} = \begin{pmatrix} 2-1 & -2+2 \\ 1-1 & -1+2 \end{pmatrix} = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix} = I$ . Since $AB = I$ , $B$ is the inverse of $A$ . [3]

19. $\vec{AB} = \mathbf{b} - \mathbf{a} = (4-2)\mathbf{i} + (-3-1)\mathbf{j} = 2\mathbf{i} - 4\mathbf{j}$ . Magnitude $|\vec{AB}| = \sqrt{2^2 + (-4)^2} = \sqrt{4+16} = \sqrt{20} = 2\sqrt{5}$ . Unit vector $= \frac{1}{2\sqrt{5}}(2\mathbf{i} - 4\mathbf{j}) = \frac{1}{\sqrt{5}}\mathbf{i} - \frac{2}{\sqrt{5}}\mathbf{j}$ . [3]

20. For no unique solution, the determinant of the coefficient matrix must be zero. $\det \begin{pmatrix} 2 & k \\ 4 & 6 \end{pmatrix} = 0$ $(2)(6) - (4)(k) = 0$ $12 - 4k = 0$ $4k = 12 \Rightarrow k = 3$ . [3]