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What is the 8th term of the geometric sequence with this explicit formula?
an = -5.(-2)(n-1)
O
A. -1280
B. -640
O
C. 1280
O
D. 640

Respuesta :

Answer:

D

Step-by-step explanation:

To find the eighth term substitute n = 8 into the explicit formula

[tex]a_{8}[/tex] = - 5 × [tex](-2)^{7}[/tex] = - 5 × - 128 = 640 → D

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