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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)2 + (2y)2 + 2 × 3x × 2y + (3x)2 + (2y)2 – 2 × 3x × 2y ...[Using the identities, (a + b)2 = a2 + b2 + 2ab and (a – b)2 = a2 + b2 – 2ab]
= 9x2 + 4y2 + 12xy + 9x2 + 4y2 – 12xy
= (9x2 + 9x2) + (4y2 + 4y2) + 12xy – 12xy
= 18x2 + 8y2
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