Question:
Let $p(x)=\sqrt{-x}$, and $q(x)=8x^2+10x-3$. The domain of $p(q(x))$ can be written in the form $a\le x \le b$. Find $b-a$.

Answer:
We have $p(q(x))=p(8x^2+10x-3)=\sqrt{-(8x^2+10x-3)}=\sqrt{-8x^2-10x+3}$. The input of this function is restricted since the quantity inside the square root cannot be negative. So we have  \begin{align*}
-8x^2-10x+3&\ge 0\\
8x^2+10x-3&\le 0\\
\end{align*}Factoring by trial and error gives  $$ (4x-1)(2x+3)\le 0$$Thus the roots of $8x^2+10x-3$ are $\frac{1}{4}$ and $-\frac{3}{2}$. Since we know the function $ 8x^2+10x-3$ is a parabola that opens up, its value is negative between the roots. Thus, our inequality is satisfied when $-\frac{3}{2}\le x \le \frac{1}{4}$. Thus $a=-\frac{3}{2}$, $b=\frac{1}{4}$, and $b-a=\frac{1}{4}-\left(-\frac{3}{2}\right)=\frac{1}{4}+\frac{6}{4}=\boxed{\frac{7}{4}}$.