Math(Quadratic Functions)

posted by Heaven

Determine the quadratic function, f(x), with x intercepts at x=7 and x=-2 and y intercept at y=5.

I have been struggling with this question for days. I have phoned my teacher and gotten her help, but I still can't figure it out. If someone could please help me with this, that would be great. Thanks

  1. Reiny

    For days ????

    since the x-intercepts of a function are the same as the roots of the corresponding equation
    x=7 ----> a factor of (x-7)
    x=-2 ---> a factor of (x+2)

    so f(x) = a(x-7)(x+2)
    we are told that (0,5) lies on it, so
    5 = a(-7)(2)
    a = -5/14

    f(x) = (-5/14)(x-7)(x+2)
    f(x) = (-5/14)x^2 - (25/14)x + 5


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