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What is the formula for the following geometric sequence?

-5, -10, -20, -40, ...

an = -5 · 2n - 1
an = -5 · (-2)n - 1
an = -2 · (-5)n - 1
an = 2 · (-5)n - 1

Respuesta :

Answer:

A

Step-by-step explanation:

The n th term formula for a geometric sequence is

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

where a is the first term and r the common ratio

here a = - 5 and r = - 10 ÷ - 5 = 2, thus

[tex]a_{n}[/tex] = - 5([tex]2)^{n-1}[/tex] → A

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