Evaluate 2&5 -1&-1 - Vidyadip

MCQ

Evaluate $\begin{bmatrix}2&5\\-1&-1\end{bmatrix}$

✓
3
B
-7
C
5
D
-2

✓

Answer

Correct option: A.

3

Expanding along $\text{R}_1,$ we get
$\triangle=2(-1)-5(-1)=2+5$

$=3$

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