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Question

(x+y)3−(x−y)3 can be factorised as

A
2y(3y2+x2)
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B
2y(3x2+y2)
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C
2x(3x2+y2)
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D
2x(x2+3y)2
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Solution

The correct option is B 2y(3x2+y2)
(x+y)3=x3+y3+3x2y+3xy2
(xy)3=x3y33x2y+3xy2
Subtracting,
(x+y)3(xy)3=2y3+6x2y
=2y(3x2+y2)
So, B is correct

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