Question

1. Factorise:
(v)36 (a + b)2 - 49a^2
​

Answer 1

36(a+b)²-49a²

=> [6(a+b)]²-(7a)²

=> (6a+6b)²-(7a²)

a²-b²= (a+b)(a-b)

=> (6a+6b+7a)(6a+6b-7a)

=>(13a+6b)(6b-a)

=> 78ab-13a²+36b²-6ab

=> -13a²+36b²+72ab

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