Question

Can someone help me solve this math problem, please? Thanks.

Answer 1

$f(x)=\frac{1}{2}x^{2}+3x$
$4f(x)=4(\frac{1}{2}x^{2}+3x)$
$4f(x)=\frac{4}{2}x^{2}+(4)(3x)$
$4f(x)=2x^{2}+12x$