matthewryan15 matthewryan15
  • 04-07-2020
  • Mathematics
contestada

Find the eight term of the geometric sequence for which a_1 = 5 and r = ­-2.

Respuesta :

ZJSG09112007
ZJSG09112007 ZJSG09112007
  • 04-07-2020

Answer:

T8 = -640

Step-by-step explanation:

[tex]a =5\\r = -2\\Tn = ar^{n-1} \\T8 =5(-2)^8^-^1\\T8 = 5(-2)^7\\T8 = 5* -128\\T8 = -640[/tex]

Answer Link
Stephen46
Stephen46 Stephen46
  • 04-07-2020

Answer:

For a geometric sequence

U(n) = ar^n-1

where

a = first term

r = common ratio

n= number of terms

From the above statement

a = 5

r = -2

n = 8

U(8) = 5(-2)^8-1

= 5(-2)^7

= - 640

Hope this helps

Answer Link

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