Question:
If $m$ is a real number and $2x^2+mx+8$ has two distinct real roots, then what are the possible values of $m$?  Express your answer in interval notation.

Answer:
By considering the expression $\frac{-b\pm \sqrt{b^2-4ac}}{2a}$ for the roots of $ax^2+bx+c$, we find that the roots are real and distinct if and only if the discriminant $b^2-4ac$ is positive. So the roots of $2x^2+mx+8$ are real and distinct when $m^2-4(2)(8) > 0$.  Simplifying and factoring the left-hand side, we find $(m-8)(m+8) > 0$, which implies $m\in \boxed{(-\infty,-8)\cup (8,\infty)}$.