8. Diketahui P(x) = 3x^3 – 2x^2 + x – 4, tentukan nilai P(5).
Jawab:
P(5) = 3(5)^3 – 2(5)^2 + 5 – 4 = 3(125) – 2(25) + 5 – 4 = 375 – 50 + 5 – 4 = 326
9. Jika P(x) = 2x^2 + 5x + 3, berapakah nilai P(2)?
Jawab:
P(2) = 2(2)^2 + 5(2) + 3 = 2(4) + 10 + 3 = 8 + 10 + 3 = 21
10. Hitunglah hasil dari P(x) = x^3 – 4x^2 + 2x + 6 jika x = -3.
Jawab:
P(-3) = (-3)^3 – 4(-3)^2 + 2(-3) + 6 = -27 – 36 – 6 + 6 = -63
