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Free CBSE - Class 12 Mathematics - Matrices worksheets

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1.
Find $x$, if $\begin{bmatrix} x & -5 & -1 \end{bmatrix} \begin{bmatrix} 1 & 0 & 2 \\ 0 & 2 & 1 \\ 2 & 0 & 3 \end{bmatrix} \begin{bmatrix} x \\ 4 \\ 1 \end{bmatrix} = O$
2.

A manufacturer produces three products $x, y, z$ which he sells in two markets. Annual sales are indicated below: 

(a) If unit sale prices of $x, y$ and $z$ are ` 2.50, ` 1.50 and ` 1.00, respectively, find the total revenue in each market with the help of matrix algebra.

3.

A manufacturer produces three products $x, y, z$ which he sells in two markets. Annual sales are indicated below: 

(b) If the unit costs of the above three commodities are ` 2.00, ` 1.00 and 50 paise respectively. Find the gross profit.

4.
Find the matrix $X$ so that $X \begin{bmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \end{bmatrix} = \begin{bmatrix} -7 & -8 & -9 \\ 2 & 4 & 6 \end{bmatrix}$
5.

If $A = \begin{bmatrix} \alpha & \beta \\ \gamma & -\alpha \end{bmatrix}$ is such that $A^2 = I$, then

1.

$1 + \alpha^2 + \beta\gamma = 0$

2.

$1 – \alpha^2 + \beta\gamma = 0$

3.

$1 – \alpha^2 – \beta\gamma = 0$

4.

$1 + \alpha^2 – \beta\gamma = 0$

6.
If the matrix A is both symmetric and skew symmetric, then
1. A is a diagonal matrix 2. A is a zero matrix 3. A is a square matrix 4. None of these
7.
If A is square matrix such that $A^2 = A$, then $(I + A)^3 – 7 A$ is equal to
1. A 2. I – A 3. I 4. 3A
8.
Find the values of $x, y, z$ if the matrix $A = \begin{bmatrix} 0 & 2y & z \\ x & y & -z \\ x & -y & z \end{bmatrix}$ satisfy the equation $A′A = I$.
9.
For what values of $x$ : $\begin{bmatrix} 1 & 2 & 1 \end{bmatrix} \begin{bmatrix} 1 & 2 & 0 \\ 2 & 0 & 1 \\ 1 & 0 & 2 \end{bmatrix} \begin{bmatrix} 0 \\ 2 \\ x \end{bmatrix} = O$?
10.
If $A = \begin{bmatrix} 3 & 1 \\ -1 & 2 \end{bmatrix}$, show that $A^2 – 5A + 7I = 0$.
- OR -

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