If function F is defined by f(x) = 3x^2 - 5x +4, what is f(x-4)

1) Because we are given f(x-4), we replace all x values in our given equations with x-4 to get 3(x-4)^2-5(x-4)+4.
2) Simplify: 3(x^2-8x+16)-5x+20+4
3x^2-24x+48-5x+24
3x^2-29x+72
Answer
D) f(x-4) = 3x^2-29x+72