Question

Factorise 1 - 25(a^2 - b^2)

Answer 1

1-25(a²-b²)

= 1 - 25 (a+b)(a-b)          [ since a²-b² = (a+b)(a-b) ]

= (1)² - [5√(a+b)(a-b)]²

= [1+5√(a+b)(a-b)][1-5√(a+b)(a-b)]            [ since a²-b² = (a+b)(a-b) ]

Answer 2

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