if A=2-k213-kis a singular matrix, then the value of 5k-k2=
0
6
-6
-4
4
Explanation for the correct option:
To find the value of 5k-k2:
Since the matrix is singular
⇒A=0⇒2-k213-k=0⇒2-k3-k-2=0⇒6-5k+k2-2=0⇒5k-k2=4
Hence, the correct option is (E).