# Is y = x^3 − 3x − 20 a quadratic function?

Aug 5, 2015

$y = {x}^{3} - 3 x - 20$ is a cubic function
$\textcolor{w h i t e}{\text{XXXX}}$$y = a {x}^{2} + b x + c$
Note that the highest degree of the variable $x$ is $2$
$\textcolor{w h i t e}{\text{XXXX}}$$y = a {x}^{3} + b {x}^{2} + c x + d$
$\textcolor{w h i t e}{\text{XXXX}}$(with the highest degree of $x$ being $3$)