The x-intercepts of a parabola form the factors of the equation. Since the x -intercepts are (-2,0) and (4,0) then the factors are (x+2) and (x-4). Factors are pieces which multiply to make the equation.
This is the standard form of the parabola . Since the y-intercept of the parabola is (0,4) then a number must also be multiplied to it