You may want to review solving
quadratics in *x*^{2} first.

The same thing works even if, instead of *x*^{2}
or *x*^{3} as the thing we're solving for, we
have *x* raised to a fractional power. The one trick here is
that even roots of *x*,
like *x*^{1 ⁄ 2}
or *x*^{1 ⁄ 4}, are always
positive or 0. So, if the Quadratic Formula gives you any negative
solutions, you should ignore them. Otherwise, it's the same as
before. (Now, of course, to get *x*, you'll need to raise to
a power instead of taking a root.)