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Question
Expand (7m − 4)2
Solution
It is known that (a + b)2 = a2 + 2ab + b2 and (a − b)2 = a2 − 2ab + b2.
(7m − 4)2
= (7m)2 − 2 × (7m) × (4) + (4)2
= 49m2 − 56m + 16
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