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|-3x + 4| = 6 + 2
|-3x + 4| = 8
(-3x + 4)² = 8²
(-3x + 4)² - 8² = 0
ingat bahwa : a² - b² = (a + b)(a - b)
maka,
(-3x + 4 + 8)(-3x + 4 - 8) = 0
(-3x + 12)(-3x - 4) = 0
-3x + 12 = 0
-3x = -12
3x = 12
x = 12/3
x = 4
-3x - 4 = 0
-3x = 4
x = -4/3
jadi, nilai x yang memenuhi adalah 4 dan -4/3