Guide 4: EVIC: General question on inequalities

[lionelpq]

When we solve equations that have absolute values, when do we need to check our answers (i.e if we get two solutions, when do we need to go back to check these two into the original equation)? Seems this would take too much time in the exam.

Thanks

[mschwrtz]

I can't top Ron's answer, so here you go:

work-your-abs-t8697.html