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Question
Simplify:
(3x + 2y)2 – (3x – 2y)2
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Solution
We have,
(3x + 2y)2 – (3x – 2y)2 = [(3x + 2y) + (3x – 2y)][(3x + 2y) – (3x – 2y)] ...[Using the identity, a2 – b2 = (a + b)(a – b)]
= (3x + 2y + 3x – 2y)(3x + 2y – 3x + 2y)
= 6x × 4y
= (6 × 4) × xy
= 24xy
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