The first term of a G.P. is 1. The sum of the third and fifth terms is 90. Find the common

This is the Solution of Question From RD SHARMA book of CLASS 11 CHAPTER SEQUENCES AND SERIES This Question is also available in R S AGGARWAL book of CLASS 11 You can Find Solution of All Question From RD SHARMA and R S AGGARWAL book from class 6-12 on our app DOUBTNUT for Free
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==== QUESTION TEXT ====
The first term of a G.P. is 1. The sum of the third and fifth terms is 90. Find the common ratio of the G.P.
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[@nikitaagarwal3192]

Sir I did not understand why did we let r2=a? And it is given that a=1, then according to you, r2 is also equal to 1??

[@vvvgamers6697]

The thing is here we can substitute r2 as any variable for example, r2=x or r2=a so the equation will stand as x2+x-90=0 and then we have to just factorise it

[@abuhuzaifa7983]

Thanks😊😊😊😊

[@riwarianarforz1585]

Question : sir at what situations do we equate any equation to zero just like you did in this problem?

[@misschulbulii5565]

Sir ye question mujhe bohot complicated lagra tha 😶...
Lekin apke explain se sab clear hai sir😊
Thankyou sir

[@ffxg786]

thank you very much sir. i looked at various places but finally understood the question from here. step by step explanation is very helpful.pls keep it up.

[@Doubtnut]

You are most welcome