# How do you evaluate a function f(x)=x+7 for a specific value, f(-3)?

Nov 20, 2016

$f \left(- 3\right) = 4$

#### Explanation:

Substitute $- 3$ for $x$ in the function:

$f \left(x\right) = x + 7$

$f \left(- 3\right) = - 3 + 7$

$f \left(- 3\right) = 4$

Nov 20, 2016

$f \left(- 3\right) = 4$

#### Explanation:

To evaluate f(-3), substitute x = - 3 into f(x)

$\Rightarrow f \left(\textcolor{red}{- 3}\right) = \left(\textcolor{red}{- 3}\right) + 7 = 4$