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# Binomial Theorem

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1. Hi need some help with a binomial theorem question.

Using pascals triangle I get

(x^5)+(5(x^4)y)+(10(x^3)(y^2)+(1 0(x^2)(y^3))+(5x(y^4))+(y^5)

After substituting in the x and y I get

31-(5*sqrt2)-(10*sqrt2^2)-(10*sqrt2^3)-(5*sqrt2^4)-(sqrt2^5)

But im pretty sure this isnt right?
Any clues to where im going wrong?
2. I assume you mean

Then for

and

so you need to check your substitution

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