Asked by Carolyn
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
I can't remember how to calculate double root values
Answers
Answered by
Reiny
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
i.e.
b^2 - 4ac = 0
12^2 - 4m(9m) = 0
144 = 36m^2
m^2 = 4
m = ± 2
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