Penyelesaian persamaan dari |x+7|^2 - 3|x+7| - 4 = 0 adalah ....
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|x + 7| = a|x + 7|² - 3|x + 7| - 4 = 0
a² - 3a - 4 = 0
(a - 4)(a + 1) = 0
Yg memungkinkan --> a = 4 (posutif)
|x + 7| = 4
x + 7 = 4
x = -3
x + 7 = -4
x = -11