Practicing Success
Practicing Success
CUET Preparation Today
For what value of x will |adj A| =-20 if A = \(\begin{bmatrix}1 & 3\\2 & 2x \end{bmatrix}\)? |
7 -41 -7 None of these |
-7 |
|adj A| = \( { |A| }^{ n-1 } \) -20 = \( { |A| }^{ 2-1 } \) -20 = |A| -20= 2x-6 2x= -14 x=-7 |
