Q. 21

# Find the values o

Answer :

Given two matrices are equal .i.e, A = B. We know that if two matrices are equal then the elements of each matrices are also equal.

a + 4 = 2a + 2

a – 2a = 2 – 4

– a = – 2

a = 2 …… (1)

And 3b = b2 + 2

b2 – 3b + 2 = 0

b2 – 2b – b + 2 = 0

b(b – 2) – 1(b – 2) = 0

(b – 2)(b – 1) = 0

b = 2 or 1 …… (2)

And – 6 = b2 – 10

b2 = – 10 + 6

b2 = – 4

b = ±2i(No real solution) …… (3)

a = 2, b = 2 or 1

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