Question

....matrix. ... ........ .................................

Answer 1

Given -

$\left[\begin{array}{cc}3 & x \\\\-5 & 7\end{array}\right] = 11$

To find -

Find the value of x

Solution -

$\left[\begin{array}{cc}3&x\\\\-5&7\end{array} \right$

$\sf{ \implies { 3 \times 7 - x \times ( -5 ) = 11 }} \\ \\ \sf{ \implies { 21 + 5x = 11 }} \\ \\ \sf{ \implies { 5x = 11 - 21 } }$

$\sf{ \implies { 5x = -10 }} \\ \\ \sf{ \implies { x = -2 }} \\ \\ \sf{ \bold { Thus , \: Option \: A \: Is \: Correct }}$

________________________________________