Answer:
3x^3-15x^2-27x
Explanation:
the function f (gx) means you have to substitute the function of gx in the function of fx were there's x
3x(x^2-5x-9)
I hope this helps
in this case it is just multiplying the two items together
the THIRD CHOICE...
3x^3 -15x^2 -27x
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