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Thread: Solving Quadratic Inequality

  1. April 8th 2011, 07:04 AM #1
    Ilsa
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    Question Solving Quadratic Inequality

    Calculate the range of values of c for which 3x^2 - 9x + c > 2.25 for all values of x.
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  2. April 8th 2011, 07:15 AM #2
    emakarov
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    Hint: 3x^2 - 9x + (c - 2.25)\ne0 for all values of x iff the discriminant of the quadratic polynomial is negative.
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