# Thread: Simplify using only postivie exponents (picture of problem included)

2. ## Re: Simplify using only postivie exponents (picture of problem included)

Originally Posted by hopex123
What have you tried?

3. ## Re: Simplify using only postivie exponents (picture of problem included)

I don't understand how to deal with the -3 exponent.

4. ## Re: Simplify using only postivie exponents (picture of problem included)

Originally Posted by hopex123
I don't understand how to deal with the -3 exponent.
$\displaystyle \displaystyle a^{-3} = \left(a^{-1}\right)^3 = \left(\frac{1}{a}\right)^3$

5. ## Re: Simplify using only postivie exponents (picture of problem included)

And from that, important for this problem $\displaystyle \left(\frac{a}{b}\right)^{-3}= \left(\frac{b}{a}\right)^3= \frac{b^3}{a^3}$