# How do you evaluate x^3 + 5 when x = 4?

Mar 31, 2018

$69$

#### Explanation:

$\text{substitute x = 4 into the expression}$

$\Rightarrow {\left(\textcolor{red}{4}\right)}^{3} + 5$

$= \left(\textcolor{red}{4} \times \textcolor{red}{4} \times \textcolor{red}{4}\right) + 5$

$= \left(16 \times \textcolor{red}{4}\right) + 5 = 64 + 5 = 69$