# How do you evaluate the expression 8b+4d if b=9, d=5?

Nov 23, 2016

Plug in each value to its corresponding variable.

$8 \textcolor{b l u e}{b} + 4 \textcolor{red}{d}$; $b = \textcolor{b l u e}{9} , d = \textcolor{red}{5}$

$8 \left(\textcolor{b l u e}{9}\right) + 4 \left(\textcolor{red}{5}\right)$

Now simplify.

$\textcolor{b l u e}{72} + \textcolor{red}{20}$

$\textcolor{g r e e n}{92}$