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January 28, 2015

January 28, 2015

Posted by **ladybug** on Sunday, October 28, 2012 at 8:49pm.

- college algebra -
**Steve**, Sunday, October 28, 2012 at 8:56pmsolve for x:

-20 = x^2 + 9x

x^2+9x+20 = 0

(x+5)(x+4) = 0

so, a = -4 or -5

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