Question the-fu

The function $h$ is defined by $h\left(x\right)=a^x+b$, where $a$ and $b$ are positive constants. The graph of $y=h\left(x\right)$ in the $xy$-plane passes through the points ($0$, $10$) and ($-2$, $\frac{325}{36}$). What is the value of $ab$?