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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 x2 - 4y2

(x - 3y)(x + 3y)

(x - 4y)(x + 2y)

(x + 2y)(x + 2y)

(x - 2y)(x + 2y)

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