NEED IN LIKE 2 MINUTES!!! A LOT OF POINTS AND WILL GIVE BRAINLIEST

If f(x)=4x^3+3x^2−5x+20 and g(x)=9x^3−4x^2+10x−55,

what is (g−f)(x)?


a)5x^3+x^2+5x+35

b)−5x^3+7x^2−15x+75

c)13x^3−x^2+5x−35

d)5x^3−7x^2+15x−75