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|x+1|² = | x- 1|
|x+1|² - |x-1| = 0
(x+1)^2 - (x -1) = 0 atau (x+1)^2 - (1 -x) = 0
x^2 + 2x +1 -x +1 0 atau x^2 + 2x +1 -1 + x= 0
x^2 + x + 1 = 0 (definit negatif)
atau x^2 + 3x = 0
x(x+3)= 0
x = 0 atau x= - 3
2)
a = 2 - |x-1|
b = |x-1| - 1
a/b = 0
a = 0 , b ≠ 0
2 - |x -1| = 0
2 -(x-1) = 0 atau 2 - (1 -x) = 0
2 - x + 1= 0 atau 2 - 1 + x = 0
x = 3 atau x = -1