Q4 of 157 Page 22

Find out the following squares by using the identities:

(p – q)2

Given (p – q)2


We know that


(a– b)2 = a2 + b2 – 2a×b


⇒ (p – q)2 = ((p)2 + (q)2 – 2×p×q)


⇒ (p – q)2 = p2 + q2 – 2pq


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