Question

Find the value for the following determinant. -32 -42 42

Answer 1

Answer:

Option C, 42

Step-by-step explanation:

As you have mentioned the matrix in the comment section. We have to find the determinant.

A = $\begin{bmatrix}5 & -4\\ 8 & 2\end{bmatrix}$

Now determinant of this matrix will be written as

|A| = 5 × 2 - 8 ( -4 )

    = 10 + 32

    = 42

Option C is the answer.

Answer 2

Using the rule for 2x2 matrices,

$\begin{vmatrix}a&b\\c&d\end{vmatrix}=ad-bc$

the determinant for your matrix is

$\begin{vmatrix}5&-4\\8&2\end{vmatrix}=5\times2-(-4)\times8=42$