Hasil dari gambar di bawah adalah.. A. 8 B. 6 C. 3 D. 1 Tolong pakai penjelasannya sama cara ya. :))

[tex] \frac{3^{n+3} - 3^{n-1}}{3^{n+1}+3^{n-1}} \\
= \frac{3^n \cdot 3^3 - \frac{3^n}{3^1}}{3^n \cdot 3^1 + \frac{3^n}{3^1}} [/tex]

Misal 3ⁿ = a

[tex] \frac{27a - \frac{a}{3}}{3a + \frac{a}{3}} \\
= \frac{a(27 - \frac13)}{a(3 + \frac13)} [/tex]

-- Coret a --

[tex] \frac{27 - \frac13}{3 + \frac13} \\
= \frac{ \frac{80}{3} }{ \frac{10}{3} } \\
= \frac{80}{10} \\
= 8 [/tex]

Jawab : A