Step-by-step explanation:
When the problem says 3f(x), it means that you are multiplying f(x) by 3. The same goes for 2g(x).
[tex]3(2x^2+8x-4)= 6x^2+24x-12[/tex]
[tex]2(5x+6) = 10x+12[/tex]
Now, we subtract f(x) from g(x) after being multiplied.
[tex](6x^2+24x-12)-(10x+12)[/tex]
[tex]6x^2+14x-24[/tex]
