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Mathematics 15 Online
OpenStudy (anonymous):

Solve x2 + 9x + 9 = 0? Quadratic Formulas

OpenStudy (ghazi):

use this with a= 1 , b= 9 and c=9 \[D= \frac{ -b \pm \sqrt {b^2-4*a*c} }{ 2a }\]

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