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bila seperti berikut ini maka penyelesaiannya jauh lebih mudah !
f(x) = (x + 3)⁴ - 12(x + 3)³ + 54 (x + 3)² - 108(x + 3) + 81
f(x) = [(x + 3) - 3)]⁴
f(x) = x⁴
f(2015) = 2015⁴
⇒ n⁴ = 2015⁴
⇒ n = 2015 ............... Jawaban
bagaimana ? silahkan dikoreksi