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

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

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    From inequality(1)：
         -13/5 < a < -1

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    The final solution set is :
         -13/5 < a < -1

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