# If f(x)=7x^2-4x, what is the value of f(2)?

$f \left(2\right) = 20$
$\text{To evaluate "f(2)" substitute x = 2 into } f \left(x\right)$
$f \left(\textcolor{red}{2}\right) = \left(7 \times {\textcolor{red}{2}}^{2}\right) - \left(4 \times \textcolor{red}{2}\right)$
$\textcolor{w h i t e}{\times x} = 28 - 8 = 20$