Q. 4 F5.0( 1 Vote )

Find out the following squares by using the identities:

(10m – 9n)2

Answer :

Given (10m – 9n)2

We know that

(a– b)2 = a2 + b2 – 2a×b

(10m – 9n)2 = ((10m)2 + (9n)2 – 2×10m×9n)

(10m – 9n)2 = 100m2 + 81n2 – 180mn

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