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Question
Factorise.
49x2 − 36
Sum
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Solution
49x2 − 36
On writing it as follows:
= (7x)2 − (6)2
Using the identity a2 − b2 = (a − b) (a + b)
= (7x − 6) (7x + 6)
= a2 − b2
= (a − b) (a + b)
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