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Mathematics 14 Online
OpenStudy (anonymous):

x-3 over x-5> 0 i really need help asap

OpenStudy (causticsyndicalist):

x > 3 over x + 5

OpenStudy (anonymous):

\[\frac{ x - 3 }{ x - 5 } > 0\] try multiplying both sides by x - 5, and be careful to adjust the inequality when the denominator is negative.

geerky42 (geerky42):

For this inequality to be false, either \(x-3\) or \(x-5\) (not both) is negative or zero. We can see that for \(x-3\) to be negative or zero, \(x\le3\) And for \(x-5\) to be negative or zero, \(x\le5\) So x need to be in range \([3,5]\), where \(x-3\) is positive or zero, but \(x-5\) is negative or zero. So multiplying both sides by \(x-5\), you have \[x-3<x-5,~3\le x\le5\] (NOTE that we flipped the sign because \(x-5\) is negative) Subtract both sides by \(x\), and you have \(-3 < -5\) which is not true. So \(x\) cannot be in range \([3,5]\) So you have \(\boxed{x <3\text{ or }x>5}\)

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