Let f be a differentiable function, defined for all real numbers x with the following properties. fâ(x) = ax^2 + bx fâ(1) = 6 and fââ(1) = 18 integral 1 to 2 of f(x) dx = 18 6=-a+18 12= a 2ax + b 18 = 2a + b b = 18-2a 18 = 24 + x b= -6 12x^2 -6x 4x^3-3x^2+C =8....+ 10 c=10