2
Question
Use the formula to find the factors.
(8) 169p2 – 81r2
(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)
= (13p)2 – (9r)2
= (13p + 9r) (13p – 9r) [a2 – b2 = (a + b) (a – b)]
∴ 169p2 – 81r2= (13p + 9r) (13p – 9r)
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