જો $A = \begin{bmatrix} 2 & -3 \\ 5 & -7 \end{bmatrix}$ હોય,તો $2A - 3A^{-1} = $

  • A
    $\begin{bmatrix} 25 & 15 \\ 25 & 20 \end{bmatrix}$
  • B
    $\begin{bmatrix} 25 & 25 \\ -15 & -20 \end{bmatrix}$
  • C
    $\begin{bmatrix} 25 & -15 \\ 25 & -20 \end{bmatrix}$
  • D
    $\begin{bmatrix} 25 & -25 \\ -15 & -20 \end{bmatrix}$

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જો $A = \begin{bmatrix} a+ib & c+id \\ -c+id & a-ib \end{bmatrix}$ અને $A^{-1} = \begin{bmatrix} a+ib & -c-id \\ -c+id & a-ib \end{bmatrix}$ હોય,તો $(a^2+b^2+c^2+d^2)$ શોધો.

જો $A = \begin{bmatrix} 1 & 2 & 3 \\ 1 & 3 & 5 \\ 2 & 1 & 6 \end{bmatrix}$ હોય, તો $(\operatorname{Adj}(\operatorname{Adj} A))^{-1} =$

જો ${A^2} - A + I = 0$ હોય,તો ${A^{-1}} = $

જો $A = [a_{ij}]_{3 \times 3}$, જ્યાં $a_{ij} = \begin{cases} 1, \text{ જો } i + j \text{ બેકી હોય} \\ 0, \text{ જો } i + j \text{ એકી હોય} \end{cases}$, તો $adj(A) = \dots$

ધારો કે $A = \begin{bmatrix} 1 & 2 \\ -2 & 1 \end{bmatrix}$ અને $B^{-1} = \begin{bmatrix} 1 & 1 \\ 0 & 2 \end{bmatrix}$ છે. જો $(A B^{-1})^{-1} = \begin{bmatrix} a & b \\ c & d \end{bmatrix}$ હોય,તો $2b + 5c + 10d =$

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