Jika f(x) = x – 2 maka 2f(x^2) – 3[f(x)]^2 – f(x) = …..

F(x) = x – 2
f(x²) = x² – 2
(f(x))² = (x – 2)²
(f(x))² = x² – 4x + 4
didapat
2.f(x²) – 3.(f(x))² – f(x)
= 2.(x² – 2) – 3.(x² – 4x + 4) – (x – 2)
= 2x² – 4 – 3x² + 12x – 12 – x + 2
= -x² + 10x – 14