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30 May, 08:53

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

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  1. 30 May, 09:39
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    (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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