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22 January, 14:25

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

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  1. 22 January, 14:54
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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)
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