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= x² - 6
= x² - 6 ----> kalikan dengan x²
16 = - 6x²
0 = - 6x² - 16
0 = (x² - 8) (x² + 2)
x² - 8 = 0 atau x² + 2 = 0
x² = 8 atau x² = - 2 (tak memenuhi)
x = √8
x = 2√2
= 1
=
= 3
3³ = X
X = 27