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I thought you were soo smart, that you would know them by now. LOL jk jk.

Lol. I'm not a calculator. I can get stuck too! :P
@OpenstudyUser

Try distributing.

\[ \Large 9^{2x} + 2(9^{x+1}) = 40 \]
Correction^

Just tell me the next and step after that please.

write 9^(x+1) as 9^x.9
then put y=9^x.
solve the quadratic

DANG!!! KILL ME!!!!
My teacher told me that. -_-
Thanks for recalling @hartnn

Just guessing, can't we do it like this?
\[9^{2x} + 2(9^x \times 9) = 40\]
Ans so on?

Next? @micahwood50

didn't i tell u to do just that?

nopes, i don't think so....no formula for log(a+b) or log (a-b)

I see. THanks man.

Did you missed a +sign in your first step?
@micahwood50

@OpenstudyUser kept on distributing. :D

I atleast tried -_-

Just do what hartnn told you to do.

I want to learn your method too! @micahwood50

My "method" is incorrect. I just though lnab = ln (a + b), but it's actually lna + lnb so forgot it.

Oh. No problem. Thanks for trying though. :)

I solved it @hartnn .
got:
x = 0.315

what roots of quadratic did u get?

2, -20

yup.
can't be -20
so 9^x=2
x=0.315
u are correct!

Yep. Thanks.