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(a) (3x +5y)2 +(3x - 5y)2
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Explanation:
(3x)2+(5y)2 +2×3x×5y + (3x)2+(5y)2-2×3x×5y
9x2+25y2+30xy +9x2+25y2 -30xy
18x2+50y2
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