Hey there!
[tex]\large\boxed{540}[/tex]
(f * g)(6) is equal to x(x-1) × 3x.
So, let's plug in 6 for x.
(f * g)(6) = 6(6-1) × 3(6)
Subtract inside parenthesis.
(f * g)(6) = 6(5) × 3(6)
Multiply.
(f * g)(6) = 30 × 18
Multiply again.
(f * g)(6) = 540
Hope this helps!
