EASY

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The number of solutions of the matrix equation $A^{2} = [\begin{array}{l} 1 & 0 \\ 0 & 1 \end{array}]$ is -

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Important Questions on Matrices

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A = (\begin{matrix} 2 & - 1 \\ - 7 & 4 \end{matrix})

and

B = (\begin{matrix} 4 & 1 \\ 7 & 2 \end{matrix})

then which of the following statement is true?

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A

is a square matrix such that

A^{2} = A

, then

(I - A)^{3} + A

is equal to

EASY

Mathematics>Algebra>Matrices>Operation on Matrices

[1 x 1] [\begin{matrix} 1 & 3 & 2 \\ 0 & 5 & 1 \\ 0 & 3 & 2 \end{matrix}] [\begin{matrix} x \\ 1 \\ - 2 \end{matrix}] = 0

, then the value of

x

HARD

Mathematics>Algebra>Matrices>Operation on Matrices

Let

P = [\begin{matrix} 1 & 0 & 0 \\ 4 & 1 & 0 \\ 16 & 4 & 1 \end{matrix}]

and

I

be the identity matrix of order

3

. If

Q = [q_{i j}]

is a matrix such that

P^{50} - Q = I,

then the value of

\frac{q_{31} + q_{32}}{q_{21}}

is equal to

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

Let

A = [\begin{matrix} \cos α & - \sin α \\ \sin α & \cos α \end{matrix}], (a \in R)

such that

A^{32} = [\begin{matrix} 0 & - 1 \\ 1 & 0 \end{matrix}] .

Then, a value of

α

is:

EASY

Mathematics>Algebra>Matrices>Operation on Matrices

A = [\begin{matrix} 1 & 2 & 3 \\ - 1 & 1 & 2 \\ 1 & 2 & 4 \end{matrix}]

then

(A^{2} - 5 A) A^{- 1} =

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A = [\begin{matrix} \cos α & - \sin α \\ \sin α & \cos α \end{matrix}]

, and

A + A^{'} = I

, then the value of

α

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

Let

A = [\begin{matrix} 1 & 0 & 0 \\ 1 & 1 & 0 \\ 1 & 1 & 1 \end{matrix}]

and

B = A^{20}

. Then the sum of the elements of the first column of

B

EASY

Mathematics>Algebra>Matrices>Operation on Matrices

A

is a symmetric matrix and

B

is skew- symmetric matrix such that

A + B = [\begin{matrix} 2 & 3 \\ 5 & - 1 \end{matrix}]

, then

A B

is equal to:

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A

is a square matrix such that

A^{2} = I

, then

(A - I)^{3} + (A + I)^{3} - 7 A

is equal to

EASY

Mathematics>Algebra>Matrices>Operation on Matrices

Let

P = [\begin{matrix} 1 & 0 & 0 \\ 3 & 1 & 0 \\ 9 & 3 & 1 \end{matrix}]

and

Q = [q_{i j}]

be two

3 \times 3

matrices such that

Q - P^{5} = I_{3}

. Then

\frac{q_{21} + q_{31}}{q_{32}}

is equal to :

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A = [\begin{matrix} 0 \\ 1 \end{matrix} \begin{matrix} - 1 \\ 0 \end{matrix}]

, then which one of the following statements is not correct?

HARD

Mathematics>Algebra>Matrices>Operation on Matrices

A

is a

3 \times 3

non-singular matrix such that

A A^{'} = A^{'} A

and

B = A^{- 1} A^{'},

then

B B^{'}

equals, where

X^{'}

denotes the transpose of the matrix

X

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

Let

A

be a matrix such that

A \cdot [\begin{matrix} 1 & 2 \\ 0 & 3 \end{matrix}]

is a scalar matrix and

|3 A| = 108

. Then,

A^{2}

equals :

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A

3 \times 4

matrix and

B

is a matrix such that

A^{'} B

and

B^{'} A

are both defined, then the order of

B

can be

EASY

Mathematics>Algebra>Matrices>Operation on Matrices

[\begin{matrix} 1 & x & 1 \end{matrix}] [\begin{matrix} 1 & 3 & 2 \\ 2 & 5 & 1 \\ 15 & 3 & 2 \end{matrix}] [\begin{matrix} 1 \\ 2 \\ x \end{matrix}] = 0

,

then

x

can be

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

A

and

B

are square matrices of the same order such that

(A + B) (A - B) =

A^{2} - B^{2},

than

{(A B A^{- 1})}^{2} i s e q u a l t o

EASY

Mathematics>Algebra>Matrices>Operation on Matrices

A

and

B

are two matrices such that

A B = B, B A = A

then

A^{2} + B^{2} =

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

If $B$ is a $3 \times 3$ matrix such that $B^{2} = 0$ , then $d e t . [{(I + B)}^{50} - 50 B]$ is equal to :

MEDIUM

Mathematics>Algebra>Matrices>Operation on Matrices

If $A = [\begin{matrix} 1 & 2 & 2 \\ 2 & 1 & - 2 \\ a & 2 & b \end{matrix}]$ is a matrix satisfying the equation $A A^{T} = 9 I$ , where $I$ is $3 \times 3$ identity matrix, then the ordered pair $(a, b)$ is equal to

The number of solutions of the matrix equation A2=1001 is -

Important Questions on Matrices

Learn and Prepare for any exam you want !

The number of solutions of the matrix equation $A^{2} = [\begin{array}{l} 1 & 0 \\ 0 & 1 \end{array}]$ is -