## anonymous one year ago solve this equation for x and round to the nearest 100th 1=In(x+4)

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1. welshfella

x + 4 = e^1 = e

2. welshfella

solve for x

3. anonymous

-4?

4. welshfella

no x + 4 = e not 0

5. anonymous

-1.28

6. welshfella

ln means log to the base e you can find the value of e on your calculator

7. anonymous

i used it

8. welshfella

looks good

9. welshfella

recall what logs are |dw:1439319631515:dw|

10. anonymous

it won't let me type the neg so i don't think it is neg

11. welshfella

the log is an exponent

12. anonymous

I'm confused on how to set it up

13. welshfella

try practicing a few similar problems

14. welshfella

like ;- transform to exponent form log10 100 = 2 answer 10^2 = 100

15. anonymous

okay i understand that one

16. anonymous

i think I'm just overthinking this

17. welshfella

maybe remember that the log is the exponent and the base is the value that the goes 'under' the exponent

18. welshfella

|dw:1439320224760:dw|

19. anonymous

okay i get it kinda

20. welshfella

yea with practice you will if a get confused i write the log10 reelation then compare it with the one in the problem log10 100 = 2 wand know that 100 = 10^2

21. anonymous

okay yeah i get that part

22. welshfella

so if we have ln(x + 1) = 1 e relates to 10 , x + 1 relates to 100 and 1 relates to 2

23. welshfella

remember that ln = log to the base e

24. anonymous

but idk where your getting the e at

25. anonymous

26. anonymous

so e^in(x+4)=e^1

27. anonymous

i got a neg number

28. anonymous

-1.28

29. freckles

that is right to the hundredths place ln is the same as log_e so the equation you had could have been written as: $1=\log_e(x+4) \\ e^1=x+4 \text{ is the same equation in exponential form } \\ e=x+4 \\$ and yes subtracting 4 on both sides gives you x is approximately -1.28

30. anonymous

it said it was wrong

31. freckles

-1.28 is right

32. freckles

the equation you typed was 1=ln(x+4) which does imply to the 100ths x=-1.28

33. anonymous

my school said that is was wrong..

34. welshfella

35. welshfella

are you sure your question is correct?

36. freckles

or the equation he typed is not the equation he should have typed

37. welshfella

yes

38. freckles

or... there is one other or but very unlikely the meaning of ln in most subjects mean log base e maybe ln means log base 2 because he is in computer science :p

39. welshfella

oh - i've never seen ln defined that way..

40. anonymous

pleaseeeeeeeeeeeeee come to my question! :) @welshfella

41. anonymous

i copied and pasted and we even used the right formula and everything

42. freckles

sometimes copy and paste doesn't work out so smoothly because you copying and pasting from a format that doesn't always translate over smoothly

43. freckles

the equation looks exactly like 1=ln(x+4) ?