algebra
posted by Mike .
Okay, I'm working with ultiplying Polynomials, and I just can't figure this one out! Here it is:
(h+k)(h squared2hk+3k squared)
haha, I don't know how to make an exponent on the computer :), but anyway, please help me figure it out!

powers are usually written this way...
(h+k)(h^2  2hk + 3k^2)
which becomes
h^3 2h^2k + 3hk^2 + kh^2  2hk^2 + 3k^3
= h^3  h^2k + hk^2 + 3k^3 
oh, I tried to solve it and got 3hk^2+h^3 I'm guessing that's wrong?

I solved it like this: h^32hk^2+3hk^2+1hk^22hk^2+3hk^2=3hk^2+h^3

for the terms inside
2h^2k + h^2k = h^2k
and
3hk^2  2hk^2 = hk^2
look at my expansion and compare it to yours,
a term in hk^2 is not the same as a h^2k term.