For part A, h needs to be factored out of the denominator completely.For part B, I've already gotten the answer DNE and it was incorrect.

Let /(x) = Vx. (a) Simplify F(5 + h) - 1(5) h Algebraically simplify your answer until you have cancelled out the factor of h in the denominator. (b) Evaluate lim f(5 + h) (5) h -0 h If an answer does not exist, enter DNE, DNE X (c) Determine the equation of the line tangent to y = f(x) at x - 5