If: $f(x)=|x-3|$ and $g(x)=2$
Solve the inequality $|x-1|<2$
I got a solution of:
$1<x<5,x\in R$
But the solution in the back the book said:
$1<x<5,x\in ^{o}$
Is this a typo or what set is $x\in^{o}$ ?
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3$\begingroup$ I have never seen that notation before, and my guess is on typo. $\endgroup$– MankindMar 25, 2016 at 1:22
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$\begingroup$ The solution to $|x-1| < 2$ is $-1 < x < 3$, not $1 < x < 5$. $\endgroup$– user169852Mar 25, 2016 at 1:39
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1$\begingroup$ Math fonts can lead to various typesetting issues. This must be one of those. $\endgroup$– Lev BorisovMar 25, 2016 at 1:40
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1 Answer
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This is a typo. It's probably also fine to not say $x \in \mathbb{R}$, since they haven't even specified the domain for $x$ in the problem.
