Asked by Riana

how to find the x intercept of d(x)=9x^2-4x+7
Answered by Steve
c'mon. It's just finding roots of a quadratic.

Since the discriminant is 16-4*9*7 < 0, there is no x-intercept
Answered by Riana
yeah i know but how will you know when to use this discriminant formula ?
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