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Find the equation of a geometric sequence given the following 2 terms.

 

 

 

a4 = −500

 

a3 = 100

 

 

 

a) an = -4(5)^n-1

 

b) an = -5(4)^n-1

 

c) an = 4(-5)^n-1

 

d) an = 5(-4)^n-1

 Jun 1, 2021

Best Answer 

 #1
avatar+32614 
+2

From a3    to   a4   is     ONE   r       a3 * r = a4

                                                         100 * r = -500

                                                               r = -5

 

 

a1 * r * r = a3

a1 * (-5)(-5) = 100

a1 = 4

 

answer c

 Jun 1, 2021
 #1
avatar+32614 
+2
Best Answer

From a3    to   a4   is     ONE   r       a3 * r = a4

                                                         100 * r = -500

                                                               r = -5

 

 

a1 * r * r = a3

a1 * (-5)(-5) = 100

a1 = 4

 

answer c

ElectricPavlov Jun 1, 2021
 #2
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Thank you so much!

Guest Jun 1, 2021

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