Question

please help:
if
g(x)=x^3+3
h(x)=3x+2
Find (3g+3h)(-x) and explain the answer please

Answer 1

\[3g+3h(-x)=3g(-3)+3h(-x)=3((-x)^3+3)+3(3(-x)+2)\]

Answer 2

then some algebra to get
\[3(-x^3+3)+3(-3x+2)\]
\[-3x^3+9-9x+6\]
\[-3x^3-9x+15\]