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Question
Use the formula to find the factors.
(5) 36r2 – 1
(5) 36r2 – 1
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Solution
36r2 – 1
= (6r)2 – (1)2
= (6r + 1) (6r – 1) [a2 – b2 = (a + b) (a – b)]
∴ 36r2 – 1 = (6r + 1) (6r – 1)
= (6r)2 – (1)2
= (6r + 1) (6r – 1) [a2 – b2 = (a + b) (a – b)]
∴ 36r2 – 1 = (6r + 1) (6r – 1)
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