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OpenStudy (anonymous):
use either completeing the square of the quadratic formula to solve the following expression. 9x^2-x^2 = x^2+4x-1
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OpenStudy (anonymous):
7x^2 + 4x -1 = 0 quad formula x (-2 - Sqrt[11]) / 7, x = (-2 + Sqrt[11]) / 7
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