## iheartfood 2 years ago question inside :)

1. iheartfood

|dw:1353461289646:dw|

2. iheartfood

this is the question, in case my handwriting/drawing is hard to see :P

3. iheartfood

answer choices A,B,C,D from top to bottom :)

4. matricked

5x

5. iheartfood

how'd u get that? :O

6. iheartfood

im not quite sure if i am understanding this right, but did u just make the 5x not an exponent, so that takes out the ln, so you get e=5x ?? idk is that right?

7. jim_thompson5910

ln is a natural log which 'undoes' the exponential function with 'e' as a base so basically ln(e^x) = x and e^[ ln(x) ] = x which tells you that f(x) = ln(x) and g(x) = e^x are inverse functions

8. iheartfood

okay, wait so my answer is ln(x) ? or is it ln(5x) ?

9. jim_thompson5910

no i'm just saying in general

10. iheartfood

wait scratch that... there is no ln(5x) haha my bad... or is it just 5x ?

11. iheartfood

ohhh okay :P i see

12. jim_thompson5910

in my example, replace each 'x' with '5x'

13. iheartfood

okay :) so my answer is B. 5x because of that? since e=x ? and x = 5x ?

14. iheartfood

is that right? since u said e=x right?

15. jim_thompson5910

you are correct, and no i didn't say e = x

16. jim_thompson5910

not sure where you got that

17. iheartfood

oops sorry! i meant this: e^[ ln(x) ] = x lol :P and okay great!! thanks!! :)

18. jim_thompson5910

i gotcha

19. iheartfood

oops sorry! i meant this: e^[ ln(x) ] = x lol :P and okay great!! thanks!! :)