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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 4x^4+8x^3-5x^2+9 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        4 * x ^ 4 + 8 * x ^ 3 - 5 * x ^ 2 + 9 <0         (1)

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    From inequality(1)：
         -2.358494 < x < -1

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    The final solution set is :
         -2.358494 < x < -1

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