y = (5 – x) (x – 15). This parabola goes through the points (5, 0) and (15, 0). Use your knowledge of the symmetry of the parabola to find the vertex.

Question

Quadratic functions can also be given in factored form. One such function is y = (5 – x) (x – 15). This parabola goes through the points (5, 0) and (15, 0). Use your knowledge of the symmetry of the parabola to find the vertex.

Answer 1

x-coordinate of the vertex is the midpoint between 5 and 15 - which is 10.

You could get the y-ccordinate by plugin=in 10 into the original equation