It is given that f′(x)=6x2−3x+8f'(x) = 6x^2 - 3x + 8f′(x)=6x2−3x+8 and that the point (1,8)(1, 8)(1,8) lies on the curve y=f(x)y = f(x)y=f(x).
Find an expression for f(x)f(x)f(x).