Hello!
To solve the function operation, plug in 0 for x, and then solve:
[tex]\begin{aligned} \sf{f(0)=-3(0)+7} \\\sf{=0+7\twoheadleftarrow anything \ times \ 0 \ is \ 0. }\\\sf{=7}\end{aligned}[/tex]
Therefore [tex]\sf{f(0)=7}[/tex].
Hope that helps! :)
-art lover
