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OpenStudy (anonymous):
Find the number of solutions of this equation using the discriminant. x² - 9x + 4 = 0
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Directrix (directrix):
discriminant b^2 - 4ac where b = -9, a = 1, and c = 4 (-9)^2 - 4 (1)(4) = 65
Directrix (directrix):
2 irrational roots
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