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Question
Expand:
(2a – 3b)2
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Solution
(2a – 3b)2
Using the identity (x − y)2 = x2 − 2xy + y2
(2a − 3b)2 = (2a)2 − 2(2a)(3b)2 + (3b)2
= 4a2 − 12ab + 9b2
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