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Verified answer
Materi : Persamaan Nilai MutlakPembahasan :
|x + 1| + 2x = 7
|x + 1| = 7 - 2x
(x + 1)² = (7 - 2x)²
(x + 1)² - (7 - 2x)² = 0
(x + 1 + 7 - 2x)(x + 1 + 2x - 7) = 0
(8 - x)(3x - 6) = 0
x = 8 ——» Tidak memenuhi
x = 2
Hp : {2}