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)
Solution:
(d) 7(a − 3b)(a + 3b)
$\left(7 a^{2}-63 b^{2}\right)=7\left(a^{2}-9 b^{2}\right)$
$=7(a-3 b)(a+3 b)$
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