Let f(x) = 8x3 − 28x + 61 and g(x) = 2x + 5. Find f of x over g of x.

4x2 + 10x + 34 + 116 over quantity of 2 x plus 5
4x2 + 10x + 34 + quantity of 2 x plus 5 over 116
4x2 − 10x + 11+ quantity of 2 x plus 5 over 6
4x2 − 10x + 11+ 6 over quantity of 2 x plus 5