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