Posted by Riana on Monday, January 28, 2013 at 6:03pm.
how to find the x intercept of d(x)=9x^24x+7

math help!  Steve, Monday, January 28, 2013 at 6:10pm
c'mon. It's just finding roots of a quadratic.
Since the discriminant is 164*9*7 < 0, there is no xintercept

math help!  Riana, Monday, January 28, 2013 at 6:16pm
yeah i know but how will you know when to use this discriminant formula ?
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