# How do you simplify 4( x - 9)?

 = color(blue)( 4x - 36
$\textcolor{b l u e}{4} \left(x - 9\right)$
$= \textcolor{b l u e}{4} \cdot \left(x\right) + \textcolor{b l u e}{4} \cdot \left(- 9\right)$
 = color(blue)( 4x - 36