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Question

Use the formula to find the factors.

(4) 16 – a2

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Solution

16 – a2
= (4)2 – (a)2
= (4 + a) (4 – a) [a2 – b2 = (a + b) (a – b)]
∴ 16 – a2 = (4 + a) (4 – a)

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