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math help!

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how to find the x intercept of d(x)=9x^2-4x+7

  • math help! -

    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! -

    yeah i know but how will you know when to use this discriminant formula ?

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