Question

If $\begin{bmatrix} x+7 & 5 \\\[0.3em] x-3 & 3 \end{bmatrix}=26,$ then $x$ =

• A. 1
• B. 3
• C. 5
• D. 7

Answer 1

Answer: (C)

5

Answer 2

As given $3x + 2 1 - 5x + 1 5$ = 26
$\Rightarrow \, - 2 x = 2 6 - 1 5 - 2 1$ = - 10
$\Rightarrow\, x = 5 \,$