SOLUTION: solve the equation using exact values. check for any extraneous roots.
9^2x+4(9^x)=21
Thank you
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Question 1042180: solve the equation using exact values. check for any extraneous roots.
9^2x+4(9^x)=21
Thank you
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Let 
, then
Solve for 
(u\ +\ 7)\ =\ 0)
So 
or 
Substitute back
Not possible. Range of 
is 
\ =\ \log(3))
\ =\ \log(3))
}{\log(9)}\ =\ \frac{\log(3)}{2\log(3)}\ =\ \frac{1}{2})
Check
John
My calculator said it, I believe it, that settles it
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