How do you find the first five terms of the geometric sequence for which #a_1=-2# and r=3?

Question

1315 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-02-20T08:42:21

#"The first five terms are: " -2,-6,-18,-54,-162#

A GP has the form

#a, ar, ar^2,ar^3,...#

#"where " a="first term" , r="common ratio"#

in this case

#a_1=a=-2 , r=3#

#1st=-2#

#2nd=-2xx3=-6#

#3rd=-6xx3=-18#

#4th=-18xx3=-54#

#5th=-54xx3=-162#

#"The first five terms are: " -2,-6,-18,-54,-162#