## algebra2sucks Evaluate the Logarithmic. log(3) 81 one year ago one year ago

1. satellite73

again your job is to solve $$3^y=81$$ for $$y$$ if you know it, you are done

2. precal

use change of base

3. satellite73

change of oil maybe

4. ParthKohli

$\log_3{81} =\rm something\iff 3^{\rm something} = 81$

5. precal

|dw:1357320013926:dw|

6. precal

|dw:1357320089930:dw|

7. precal

|dw:1357320112900:dw|you could also use the definition of a log

8. precal

3 to what power will give you 81

9. algebra2sucks

3 to the 4th powwer

10. precal

|dw:1357320318399:dw|yes you are correct

11. algebra2sucks

Thank you all!

12. precal

yw