Quizzz
Terlampir ^^ 
Terlampir ^^
Penjelasan dengan langkah-langkah:
3^n - 1 = 81
3^n - 1 = 3⁴ → coret 3
n - 1 = 4
n = 4 + 1
n = 5
Jawaban:
[tex] \sf {3}^{n - 1} = 81[/tex]
[tex] \sf {3}^{n - 1} = {3}^{4} [/tex]
[tex] \sf { \cancel3}^{n - 1} = { \cancel3}^{4} [/tex]
[tex] \sf{}n - 1 = 4[/tex]
[tex] \sf {}n = 4 + 1[/tex]
[tex] \sf{}n = 5[/tex]
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