8. Tentukanlah lim x -> 3 (4x^2 + 6x – 8)
Jawab: substitusi nilai x = 3, maka lim x -> 3 (4x^2 + 6x – 8) = 4(3)^2 + 6(3) – 8 = 46
9. Hitunglah lim x -> 0 (sin 2x / x)
Jawab: lim x -> 0 (sin 2x / x) = lim x -> 0 (sin 2x / 2x) = 1
10. Tentukanlah lim x -> 1 (x^2 – 1) / (x – 1)
Jawab: faktorkan x^2 – 1 menjadi (x – 1)(x + 1)
Sehingga lim x -> 1 (x^2 – 1) / (x – 1) = lim x -> 1 (x – 1)(x + 1) / (x – 1) = lim x -> 1 (x + 1) = 2
