Find only the rational zeros. x^4 + 9
Thanks!
Your problem asks for the rational roots of:Originally Posted by kharris82
$\displaystyle
x^4+9=0
$
This may be rewritten as:
$\displaystyle
x^4=-9
$.
Now as $\displaystyle x$ is real $\displaystyle x^4$ is positive which contradicts
the equation, so there can be no real roots of $\displaystyle x^4+9=0$, and
so there are no rational roots.
RonL