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Question

Tick (✓) the correct answer:
(7a2 − 63b2) = ?
(a) (7a − 9b)(9a + 7b)
(b) (7a − 9b)(7a + 9b)
(c) 9(a − 3b)(a + 3b)
(d) 7(a − 3b)(a + 3b)

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Solution

(d) 7(a − 3b)(a + 3b)

(7a2 -63b2)=7(a2 -9b2) =7(a -3b)(a+3b)

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