Asked by Mathelp

Can someone please help me on this question or help me get started.

(2x^y+x^-y)^3
= (2x^y+x^-y)(2x^y+x^-y)(2x^y+x^-y)
= ???

Now what do I do next?

please help and thank you
Answered by Mathelp
8x^3y+8x^y+2x^-y+4x^y+4x^-y+x^-3y

What do I do with the exponents?
Answered by Mathelp
Is this correct so far?
Answered by Anonymous
is this the right answer?

20x^5y+7x^-5y

What do you do with the negative exponent? Do you just leave it how it is?
Answered by Reiny
correct so far
all you have to do is collect your like terms
you have 8x^y + 4x^y which is 12x^y
and 2x^-y + 4x^-y which is 6x^-y

= 8x^(3y) + 12x^y + 6x^-y + y^(-3y)
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