Diketahui integral f(x) dx = 1/4ax^2 + bc + c dan a =/= 0.

Diketahui integral f(x) dx = 1/4ax^2 + bc + c dan a =/= 0. Jika f(a) = (a+2b)/2 dan f(b) = 6, maka fungsi f(x) = (A) 1/2x+4 (B) 2x+4 (C) 1/2x-4 (D) x+4 (E) -1/2x+4