Question

if r(x)=120+18x-3x^2 what is r(2)

Answer 1

$r(x)=120+18x-3x^2$               (replace x with 2)
$r(2)=120+18(2)-3(2)^2$
$r(2)=120+18(2)-3(4)$
$r(2)=120+36-12$
$r(2)=144$
answer