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Question

Prove that:
(x+y)3= x3 +y3 + 3x2y +3xy2

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Solution

Dear Student,

x+y3=x+y2 x+y=x2+2xy+y2 x+y Since a+b2=a2+2ab+b2 =x2 x+y +2xy x+y + y2 x+y=x3+x2y+2x2y+2xy2+xy2 + y3=x3 + y3 + 3x2y + 3xy2


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