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Verified answer
Bab Nilai MutlakMatematika SMA Kelas X
|x + 7|² - 3 |x + 7| - 4 = 0
|x + 7| = a
a² - 3a - 4 = 0
(a - 4) (a + 1) = 0
a - 4 = 0 atau a + 1 = 0
a = 4 a = - 1
|x + 7| = 4 |x + 7| = -1
x + 7 = 4 nilai mutlak tidak menghasilkan bil. negatif
x = 4 - 7 tidak ada penyelesaian
x = -3
x + 7 = -4
x = - 4 - 7
x = -11
HP = { -11, -3 }