Geometry

mx^2+12x+9m=0. for what values of m will the equation have one repeated root?
I can't remember how to calculate double root values

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  1. quadratic have double, or equal roots when the discriminant is zero
    i.e.
    b^2 - 4ac = 0

    12^2 - 4m(9m) = 0
    144 = 36m^2
    m^2 = 4
    m = ± 2

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