Finish the steps below to write a quadratic function for the parabola shown. 4 Use the vertex form, f(x) = a(x - h)2 + k, and substitute in the values for h and ke. f(x) = a(x – 5)2 + 3 2. Use another point and substitute in values for x and f(x). Solve for a. 5 = a(6 – 5)2 + 3 3. Write the function, using the values for h, k, and a. The function is f(x) = Tx - 12​