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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality ln(x^4+5x^3+x^2-7x+28) <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ln ( x ^ 4 + 5 * x ^ 3 + x ^ 2 - 7 * x + 28 ) <0         (1)
        From the definition field of ln
         x ^ 4 + 5 * x ^ 3 + x ^ 2 - 7 * x + 28 > 0        (2 )

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    From inequality(1)：
         -3.622661 < x < -3.283604
    From inequality(2)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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    From inequalities (1) and (2)
         -3.622661 < x < -3.283604     (3)

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    The final solution set is :
         -3.622661 < x < -3.283604

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