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OpenstudyUser Group TitleBest ResponseYou've already chosen the best response.0
I thought you were soo smart, that you would know them by now. LOL jk jk.
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Lol. I'm not a calculator. I can get stuck too! :P @OpenstudyUser
 2 years ago

OpenstudyUser Group TitleBest ResponseYou've already chosen the best response.0
Try distributing.
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
\[ \Large 9^{2x} + 2(9^{x+1}) = 40 \] Correction^
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Just tell me the next and step after that please.
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
write 9^(x+1) as 9^x.9 then put y=9^x. solve the quadratic
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
DANG!!! KILL ME!!!! My teacher told me that. _ Thanks for recalling @hartnn
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Just guessing, can't we do it like this? \[9^{2x} + 2(9^x \times 9) = 40\] Ans so on?
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Next? @micahwood50
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
didn't i tell u to do just that?
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Yes, but you said me to write 9^x = y Got that. But can't we solve it by another way? Something like: \[9^{2x} + 2(9^x)\times 18=40\]
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
nopes, i don't think so....no formula for log(a+b) or log (ab)
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
I see. THanks man.
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Did you missed a +sign in your first step? @micahwood50
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
@OpenstudyUser kept on distributing. :D
 2 years ago

OpenstudyUser Group TitleBest ResponseYou've already chosen the best response.0
I atleast tried _
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Just do what hartnn told you to do.
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
I want to learn your method too! @micahwood50
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
My "method" is incorrect. I just though lnab = ln (a + b), but it's actually lna + lnb so forgot it.
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Oh. No problem. Thanks for trying though. :)
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
I solved it @hartnn . got: x = 0.315
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
what roots of quadratic did u get?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
yup. can't be 20 so 9^x=2 x=0.315 u are correct!
 2 years ago

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.1
Yep. Thanks.
 2 years ago
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