Q1 of 59 Page 7

Expand the following

(P – 2q + r)2

(P – 2q + r)2


Here we use the identity of


(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx


∴ (p – 2q + r)2


= (p)2 + (– 2q)2 + (r)2 + 2(p)(– 2q) + 2(– 2q)(r) + 2(r)(p)


= p2 + 4q2 + r2 – pq – 4qr + 2rp


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