# How do you multiply (9x + 8)(9x + 3)?

Sep 4, 2016

$81 {x}^{2} + 99 x + 24$

#### Explanation:

Consider: color(blue)((9x+8)color(brown)((9x+3))

Multiply everything inside the right hand side (RHS) bracket by everything in the left hand side (LHS) bracket. Giving:

Notice that the + from $+ 8$ follows the 8

$\textcolor{b r o w n}{\textcolor{b l u e}{9 x} \left(9 x + 3\right) \textcolor{w h i t e}{\ldots \ldots .} \textcolor{b l u e}{+ 8} \left(9 x + 3\right)}$

$81 {x}^{2} + 27 x \textcolor{w h i t e}{\ldots \ldots} + 72 x + 24$

$81 {x}^{2} + 99 x + 24$