Given :

To find : x

Formula used :

Where c_ij = a_i1b_1j + a_i2b_2j + a_i3b_3j + ……………… + a_inb_nj

If A is a matrix of order a b and B is a matrix of order c d ,then matrix AB exists and is of order a d ,if and only if b = c

= 0

=

=

=

= = = 0

2x² + 6x + 4 = 0

x² + 3x + 2 = 0

(x + 1)(x + 2) = 0

x + 1 = 0 or x + 2 = 0

x = -1 or x = -2

x = -1 or x = -2