When using the binomial formula, which of the following is a correct step in the expansion of (x+y)^4?

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03-03-2017
Mathematics

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When using the binomial formula, which of the following is a correct step in the expansion of (x+y)^4?

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charlottekrist charlottekrist · Answer 1 · 2017-03-03T17:19:34+01:00

charlottekrist charlottekrist

03-03-2017

(X+y)^2(x+y)^2
(X^2+2xy+y^2)(X^2+2xy+y^2)
X^2(x^2+2xy+y)+2xy(x^2+2xy+y)+y^2(x^2+2xy+y)

X^4+4x^3y+6x^2y^2+4xy^3+y^4 is the answer.i didn't write all the steps as I would have been too long and complicated

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