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Question

(3x + 5y)3 - (2x - y)3

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Solution

3x + 5y3 - 2x - y3=3x + 5y-2x - y3x + 5y2 +3x + 5y2x - y + 2x - y2=x +6y9x2 + 25y2 + 30xy + 6x2 -3xy + 10xy -5y2 + 4x2 - 4xy + y2=x +6y19x2 + 33xy + 21y2

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