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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality sqrt(49*k*k+56*k) >-7*k-2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         sqrt ( 49 * k * k + 56 * k ) > -7 * k - 2         (1)
        From the definition field of √
         49 * x * x + 56 * x ≥ 0        (2 )

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    From inequality(1)：
         k ＞ -0.032571
    From inequality(2)：
         k ≤ -8/7 或  k ≥ 0

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    From inequalities (1) and (2)
         k ≥ 0    (3)

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    The final solution set is :
         k ≥ 0

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