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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality a+4 >= sqrt(a^2+16) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a + 4 >= sqrt ( a ^ 2 + 16 )         (1)
        From the definition field of √
         x ^ 2 + 16 ≥ 0        (2 )

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    From inequality(1)：
         a ≥ 0
    From inequality(2)：
         a ∈ 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)
         a ≥ 0    (3)

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    The final solution set is :
         a ≥ 0

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