23-09-2016
Mathematics

contestada

Solve 2|x|-1=3 and give the final answers that would make it the equations true

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23-09-2016

remember
|x| makes x positive

so if ou have
|x|=y
assume
x=y and -x=y

so

2|x|-1=3
add 1 to both sides
2|x|=4
divide both sides by 2
|x|=2
assume
x=2
-x=2

so therefor
x=-2 and/or 2

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