1.- x2 −3x −4 = 0
2.- 5 x2 −6x −1 = 0
3.- 3 x2 −24 x = 0
4.- 3 ( x2 – 9) =
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1.- x2 −3x −4 = 0
2.- 5 x2 −6x −1 = 0
3.- 3 x2 −24 x = 0
4.- 3 ( x2 – 9) =