factorize the equation
5x^2+4x-9
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5x^2 + 4x - 9 = 0
5x^2 + 9x - 5x - 9 =0
5x^2 - 5x + 9x - 9 =0
5x(x-1) + 9(x-1) =0
(5x+9) (x-1) = 0
x = 1 and x = -9/5
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