Let f(x) = 3x3 − 7x2 − 9x + 21 and g(x) = 3x − 7. find f of x over g of x.
3x2 − x
x2 − 3x
3x2 − 3
x2 − 3

x^2-3

Step-by-step explanation:

look at the picture

For this case we have the following functions:

We must find the value of the following expression:

So:

Looking at the attached image we have to:

Option D

See attached image

if you was gonna solve for a, a is a   < -12