# How do you evaluate the function f(x)=5^x at the value of x=-pi?

Jul 7, 2017

$f \left(- \pi\right) \approx 0.00637$

#### Explanation:

$f \left(x\right) = {5}^{x}$

$\therefore f \left(- \pi\right) = {5}^{-} \pi$

$= \frac{1}{5} ^ \pi$

$\approx \frac{1}{{5}^{3.14159}}$

$\approx \frac{1}{156.992}$

$\approx 0.00637$