Question

Simplify:
(i) (a + 7)hole square+ (a - 7)hole square​

Answer 1

Answer:

(a + 7)² + (a - 7)²

= (a² + 49 + 14a) + ( a² + 49 - 14a)

= a² + 49 + 14a + a² + 49 - 14a = 2a² + 98

therefore, answer of this is 2a² + 98

Answer 2

(a+7)²=a²+14a+49

(a-7)²=a²-14a+49

a²+14a+49+a²-14a+49

2a²+98

2(a²+49)

14a and-14a gets cancel due to opposite signs

take 2 as common in 2a²+98

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