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check math

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Here are my answers. Can you check if I got the right answers? Thank you!

(x+y)^3= x^3+3x^2y+3xy^2+y^3

= x^(5/2)+x^4-x^(3/2)

the last term in the second question should be - x^(7/2), (you were adding 5/2 and 2 in the exponents)

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