Question

Evaluate using the identity (a + b)2 = a2 + 2ab + b2

532

Answer 1

532 = (50 + 3)2 (a + b)2

= a2 +2ab + b2

Here a = 50, b = 3

(50 + 3)2 = 502 + 2 × 50 × 3 + (3)2

= 2500 + 300 + 9

532 = 2809