# How do you evaluate the function f(x)=x^2+1 for f(-3)?

##### 1 Answer
Jul 30, 2017

See a solution process below

#### Explanation:

To evaluate the function for $f \left(- 3\right)$ we need to substitute $\textcolor{red}{- 3}$ for every occurrence of $\textcolor{red}{x}$ and then evaluate the results:

$f \left(\textcolor{red}{x}\right) = {\textcolor{red}{x}}^{2} + 1$ becomes:

$f \left(\textcolor{red}{- 3}\right) = {\textcolor{red}{- 3}}^{2} + 1$

$f \left(\textcolor{red}{- 3}\right) = \textcolor{red}{9} + 1$

$f \left(\textcolor{red}{- 3}\right) = 10$