25 views

The vale f ‘a’ for which the matrix becomes a singular matrix

i feel for any value f ‘a’ the determinant would be zero however the answer mentioned is a=3.

$2R_2 - R_3 = R_1$
$2(2a) - 3a = a$ which is always true. What explanation have they given for $a = 3$ ? Is it part of an augmented matrix or something ?