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29 November, 13:41

For what values of the variable x is the expression square root of 7x+14 + square root of 7-x a real number?

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  1. 29 November, 14:09
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    √ (7·x + 14) + √ (7 - x)

    7·x + 14 ≥ 0 - -> x ≥ - 2

    7 - x ≥ 0 - -> x ≤ 7

    x ∈ [-2; 7]
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