Question 1176215
.
The sum of the second and third terms of a geometric sequence is 18 . If the tenth term is 4 times the seventh term , find ; 
a) the first term
 b) the common ratio 
c) the sixth term
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The solution by @CubeyThePenguin is  TOTALLY  WRONG.



For your safety,  ignore his post   //   until he fix it (!)



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Also notice that  @josgarithmetic  CHANGED  the original numbers in your post, 

replacing the original piece   " If the tenth term is  4  times the seventh term "

by   "If the tenth term is  8  times the seventh term"


                    W I T H O U T   any   A C N O L E D G M E N T.



                            So be  A W A R E   (!)