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x^4 - 4x^2 + 4 = f(x^2-2)
dimisalkan
x^2-2 = p
x^2 = p + 2
x = akar p + 2
⇩
f(p) = (akar p+2)^4 - 4(akar p+2)^2 + 4
= p^2 + 4p + 4 - 4p - 8 + 4
= p^2
jadi f(x) = x^2
maaf kalo salah