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06-08-2016
Mathematics

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

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dalendrk dalendrk

06-08-2016

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)

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