Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 9x^2-12×x-28 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        9 * x ^ 2 - 12 × x - 28 <0         (1)

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    From inequality(1)：
         -1.218951 < x < 2.552285

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    The final solution set is :
         -1.218951 < x < 2.552285

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