+0  
 
-1
130
3
avatar

Find the 8th term of the geometric sequence 7, -21, 63, 

 Dec 10, 2020
 #1
avatar
+1

 

Find the 8th term of the geometric sequence 7, -21, 63,    

 

The factor seems to be –3 so your sequence would be 

 

Term Number           Term Value  

 

       1                                   3  

       2                               –21  

       3                                 63  

       4                             –189  

       5                               567  

       6                          –1,701  

       7                            5.103  

       8                        –15,309  

.

 Dec 10, 2020
edited by Guest  Dec 10, 2020
 #2
avatar
+1

 

Sheesh, why am I so clumsy?  The first term is 7 of course.  

.

Guest Dec 10, 2020
 #3
avatar+117546 
+1

Common ratio  =  -21/7 =  -3

 

8th term  =  7 (-3)^(n - 1)   =  7(-3)^(8-1)  = 7(-3)^7  = 7 (-2187)  = -15309

 

 

cool cool cool

 Dec 10, 2020

69 Online Users

avatar
avatar
avatar