purse Packet on computing derivatives using the limit definition Let f(x) = 4x2 - 15x. (a) Simplify ( 4 + h) - f(4) h Algebraically simplify your answer until you have cancelled out the factor of h in the denominator. (b) Evaluate lim f ( 4 + h ) - f ( 4 ) h - 0 h If an answer does not exist, enter DNE. (c) Determine the equation of the line tangent to y = f(x) at x = 4. y=