# How do you multiply (x + 1)(x + 4)?

Jul 1, 2015

=color(blue)(x^2 + 5x +4

#### Explanation:

$\textcolor{b l u e}{\left(x + 1\right)} \left(x + 4\right)$

$= \textcolor{b l u e}{\left(x\right)} . \left(x + 4\right) + \textcolor{b l u e}{1} . \left(x + 4\right)$

$= {x}^{2} + 4 x + x + 4$
=color(blue)(x^2 + 5x +4