1
Question
Factorise:
(5) 9 − 16m2
(5) 9 − 16m2
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Solution
9 − 16m2
= (3)2 − (4m)2
= (3 + 4m) (3 − 4m) [a2 − b2 = (a + b) (a − b)]
∴ 9 − 16m2 = (3 + 4m) (3 − 4m)
= (3)2 − (4m)2
= (3 + 4m) (3 − 4m) [a2 − b2 = (a + b) (a − b)]
∴ 9 − 16m2 = (3 + 4m) (3 − 4m)
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