Q. 18

# Show that</

A = A2 = = = 4A = 4 42I = 42 Now,

A2 + 4A – 42I = = Hence, = Now, A2 + 4A – 42I = 0

= A – 1. A . A + 4 A – 1.A – 42 A – 1.I = 0

= IA + 4I – 42A – 1 = 0

= 42A – 1 = A + 4I

= A – 1 = = A – 1 = Rate this question :

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