Question 833280
{{{ graph( 300, 300, -2, 10, -6, 6, (x-1)(x-3)(x-5)) }}} 
The zeros are {{{1}}},{{{3}}}, and {{{5}}}.
Choose a point in each region and test it in the inequality.
{{{x<1}}}, {{{x=0}}}, {{{(0-1)(0-3)(0-5)>=0}}},{{{-15>=0}}},False
{{{1<x<3}}}, {{{x=2}}},{{{(2-1)(2-3)(2-5)>=0}}},{{{3>=0}}},True
{{{3<x<5}}}, {{{x=4}}},{{{(4-1)(4-3)(4-5)>=0}}},{{{-3>=0}}},False
{{{x>5}}} ,{{{x=6}}},{{{(6-1)(6-3)(6-5)>=0}}},{{{15>=0}}},True
You can also look at the graph and see when it is above the y-axis.