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We know that

(a + b)(a b) = a2 - b2

So

a2 - b2 = (a + b) (a b)

This means that we can factor any expression of the form a2 - b2.


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Question 1/5

1. Factorise a2 - 64b2

(a - 8b)(a + 8b)

(a - 16b)(a + 16b)

(a + 16b)(a + 16b)

(a - 8b)(a - 8b)

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