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3 = 3x²
x² = 3/3 = 1 ⇒ x = +- 1
untuk x = 1 ⇒ 3x = x³ + k
⇒ 3(1) = (1)³ + k ⇒ k = 2
untuk x = -1 ⇒ 3x = x³ + k
⇒ 3(-1)= (-1)³ + k
⇒ -3 = -1 + x ⇒ k = -2