Q. 4 G5.0( 2 Votes )

Find out the following squares by using the identities:

(0.4a – 0.5b)2

Answer :

Given (0.4a – 0.5b)2


We know that


(a– b)2 = a2 + b2 – 2a×b


(0.4a – 0.5b)2 = ((0.4a)2 + (0.5b)2 – 2×0.4a×0.5b)


(0.4a – 0.5b)2 = 0.16a2 + 0.25b2 – 0.4ab


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