Answer :

(i) We use (a + b)2 = a2 + 2ab + b2


(4x + 3)2 = (4x)2 + 2× 4x × 3 + 32


(4x + 3)2 = 16x2 + 24x + 9


(ii) We use (a + b)2 = a2 + 2ab + b2


(x + 2y)2 = x2 + 4xy + 4y2


(iii) We use (a + b)2 = a2 + 2ab + b2



(iv) We use (a - b)2 = a2- 2ab + b2



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