Posted by **Riana** on Monday, January 28, 2013 at 6:03pm.

how to find the x intercept of d(x)=9x^2-4x+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 16-4*9*7 < 0, there is no x-intercept

- 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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