Answer:
144x^2-47x+4
Step-by-step explanation:
(g•f)(x) = g(f(x))
= g(6x-1)
= 4(6x-1)^2 + x
= 4*(36x^2-12x+1) + x
= 144x^2-48x+4+x
= 144x^2-47x+4
