Answer :

Given :


To find : x


Formula used :



Where cij = ai1b1j + ai2b2j + ai3b3j + ……………… + ainbnj


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


12x + 20 = 0


12x = -20


x = =


x =


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