# What is the standard form of  y= (x + 2)(x – 4) ?

Dec 2, 2017

$y = {x}^{2} - 2 x - 8$

#### Explanation:

$\text{the equation of a parabola in "color(blue)"standard form}$ is.

•color(white)(x)y=ax^2+bx+c color(white)(x);a!=0

$\text{expand the factors using FOIL}$

$y = {x}^{2} - 4 x + 2 x - 8$

$\textcolor{w h i t e}{y} = {x}^{2} - 2 x - 8 \leftarrow \textcolor{b l u e}{\text{in standard form}}$