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For the following geometric sequence, find the explicit formula.
{1, -3, 9, ...}

an = -3 · an - 1 where a1 = 1
an = -3 · an - 1 where a1 = -1
an = -1 · (-3)n - 1
an = (-3)n - 1

Respuesta :

tramserran

Answer: [tex]a_{n} = (-3)^{n-1}[/tex]

Step-by-step explanation:

[tex]a_{n} = a_{1} r^{n-1}[/tex]   ; where a₁ is the first term and r is the ratio

[tex]a_{n} = 1 (-3)^{n-1}[/tex]

[tex]a_{n} = (-3)^{n-1}[/tex]

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