|x-1| + |x-3| = 4 Help meh

|x - 1| + |x - 3| = 4
|2x - 4| = 4
2|x - 2| = 4
|x - 2| = 4 : 2
(x - 2)² = 2²
x² - 4x + 4 - 4 = 0
x² - 4x = 0
(x - 2)(x + 2) = 0
x = 2 dan x = -2

HP {2 , -2}

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