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jmc

algebra intermediate

Problem

Find all real numbers which satisfy (Give your answer in interval notation.)
Solution
Subtracting from both sides, we get or Negating both sides, we have Letting we make a sign table with the two factors and : \begin{array}{c|cc|c} &$x-5$ &$x-3$ &$f(x)$ \\ \hline$x<3$ &$-%%DISP_0%%amp;$-%%DISP_0%%amp;$+$\\ [.1cm]$3<x<5$ &$-%%DISP_0%%amp;$+%%DISP_0%%amp;$-$\\ [.1cm]$x>5$ &$+%%DISP_0%%amp;$+%%DISP_0%%amp;$+$\\ [.1cm]\end{array}We see that when as well as at the endpoint Therefore, the solution set is the interval
Final answer
(3, 5]