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Question

Use the formula to find the factors.

(8) 169p2 – 81r2

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Solution

169p2 – 81r2
= (13p)2 – (9r)2
= (13p + 9r) (13p – 9r) [a2 – b2 = (a + b) (a – b)]
∴ 169p2 – 81r2= (13p + 9r) (13p – 9r)

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