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March 28, 2017

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solving equations with two absolute value brackets

|x+4| = |x-2|
so i want to know how to do this? do i always have to write out the four piecewise possibilities? that be ++ -+ and +-

++
x+4 = x-2
4 = -2 not solution

-+
-(x+4) = x-2
-x-4 = x-2
-4 = 2x-2
-1 = x solution

+-
x+4 = -(x-2)
x+4 = -x+2
2x+4 = 2
x = -1 solution

  • math-calculus oops - ,

    i forgot put the other one

    --
    -(x+4) = -(x-2)
    -x+4 = -x+2
    4 = 2 no solution

  • math-calculus - ,

    you are correct.

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