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{x}^(2) - 1 < 18 ​
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{x}^(2) - 1 < 18
​

User Lydell
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</p><p>x^2-1 < 18 \\</p><p>x^2 < 19 \\</p><p>x < √(19)</p><p>

Hope this helps.

User Mahammad Adil Azeem
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