Me idk what to do use the parabola tool to graph the quadratic function f(x)=(x−4)(x+2) . graph the parabola by first plotting its vertex and then plotting a second point on the parabola.

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6