3 years ago

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

Mathematics

1 answer:

I am Lyosha [343]3 years ago

4 0

Answer:

√(7·x + 14) + √(7 - x)

7·x + 14 ≥ 0 --> x ≥ -2

7 - x ≥ 0 --> x ≤ 7

x ∈ [-2 ; 7]

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