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Saying that 4 < sqrt(x) < 9 is equivalent to is saying what about x?
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Saying that 4 < sqrt(x) < 9 is equivalent to is saying what about x?

User Alex Spence
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x ≥ 0

4 < √x < 9 ⇒ 4² < x < 9² ⇒ 16 < x < 81

x = 5² = 25 or x = 6² = 36 or x = 7² = 49 or x = 8² = 64

x∈(16; 81)
User GabrieleMartini
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