Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

.Sam.

A problem Solve for x, 7.3^(x-1)+5-3^(x+1)=0

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    \[\huge 7.3^{x-1}+5-3^{x+1}=0\]

    • 2 years ago
  2. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    is that 7*3^(x-1) or (7.3)^(x-1)

    • 2 years ago
  3. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    decimal

    • 2 years ago
  4. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    hmmm, doesnt look easy

    • 2 years ago
  5. lgbasallote
    Best Response
    You've already chosen the best response.
    Medals 0

    do tell me..does this involve canceling 3^x-1 the solution i thought had that..

    • 2 years ago
  6. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    \[3^x = \frac{15}{2}\] \[x = \log_3 \frac{15}2\]

    • 2 years ago
  7. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    @Ishaan94 that's true if the decimal was "dot" *

    • 2 years ago
  8. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh, my bad... so it's \[(7.3)^{x-1} + 5-3^{x+1}=0\]Hmm Now I feel stupid :/

    • 2 years ago
  9. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    ok I have an idea

    • 2 years ago
  10. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1333364793236:dw|

    • 2 years ago
  11. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1333364860619:dw|

    • 2 years ago
  12. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    campbell decimal point, 7.3 = 73/10

    • 2 years ago
  13. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    :/

    • 2 years ago
  14. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    its an annoying problem. whats the bloody solution?

    • 2 years ago
  15. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    ln(a+b) is not the same as lna +lnb

    • 2 years ago
  16. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    You can't take log like that

    • 2 years ago
  17. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    I think 7.3 has something to do with 5, we should try to use 5

    • 2 years ago
  18. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    did sam leave,

    • 2 years ago
  19. experimentX
    Best Response
    You've already chosen the best response.
    Medals 0

    wolf's answer http://www.wolframalpha.com/input/?i=7.3%5E%28x-1%29%2B5-3%5E%28x%2B1%29%3D0

    • 2 years ago
  20. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    why did he say this is easy problem

    • 2 years ago
  21. karatechopper
    Best Response
    You've already chosen the best response.
    Medals 0

    hhe says its easy and im still stuck on first step, can i switch signs?

    • 2 years ago
  22. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    Who is hhe?

    • 2 years ago
  23. karatechopper
    Best Response
    You've already chosen the best response.
    Medals 0

    i meant he, meaning sam

    • 2 years ago
  24. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    i think this could somehow become a quadratic, with the right substitution

    • 2 years ago
  25. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1333366072740:dw|

    • 2 years ago
  26. experimentX
    Best Response
    You've already chosen the best response.
    Medals 0

    i don't think general method we use would work

    • 2 years ago
  27. experimentX
    Best Response
    You've already chosen the best response.
    Medals 0

    how do you solve this 2^x - x = 2

    • 2 years ago
  28. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    I think we could only use newtons method......

    • 2 years ago
  29. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    first we approximate an answer....

    • 2 years ago
  30. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    i want an EXACT solution

    • 2 years ago
  31. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    then use the newton's method to get a better aproximation

    • 2 years ago
  32. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    we continue this until we're satisfied

    • 2 years ago
  33. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    but we can't still get the exact though :(

    • 2 years ago
  34. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    summon sam

    • 2 years ago
  35. experimentX
    Best Response
    You've already chosen the best response.
    Medals 0

    currently the best way to solve is graphical method ... lol

    • 2 years ago
  36. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah

    • 2 years ago
  37. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    the number 5 is irritating

    • 2 years ago
  38. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    i sent sam a message, he better respond .

    • 2 years ago
  39. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    what is classic about this problem anyway?

    • 2 years ago
  40. Ishaan94
    Best Response
    You've already chosen the best response.
    Medals 0

    @satellite73

    • 2 years ago
  41. satellite73
    Best Response
    You've already chosen the best response.
    Medals 0

    i assume that is \(7.3^{x-1}\) and not \(7\cdot 3^{x-1}\) so i have no ideas yet

    • 2 years ago
  42. satellite73
    Best Response
    You've already chosen the best response.
    Medals 0

    must be something special about 7.3 that i do not see

    • 2 years ago
  43. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    can you guys tell me later, i gotta sleep

    • 2 years ago
  44. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    ok try this , let u = 3^(x+1)

    • 2 years ago
  45. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    i assume there is an exact solution, otherwise youve wasted my time

    • 2 years ago
  46. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    I can see that you guys think so hard, lol

    • 2 years ago
  47. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    please give us hint

    • 2 years ago
  48. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    Sad thing for you @perl There's no exact solution but approximation \[7.3^{x-1}=3^{x+1}-5\]

    • 2 years ago
  49. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    i knew that newtoms method of approximation yesterday..

    • 2 years ago
  50. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    I TOLD YOU SO

    • 2 years ago
  51. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    from yesterday*

    • 2 years ago
  52. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    it would be more interesting if there was exact solution , :(

    • 2 years ago
  53. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    i was confused since you said it was easy problem , rats

    • 2 years ago
  54. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    newton's method :D

    • 2 years ago
  55. anonymoustwo44
    Best Response
    You've already chosen the best response.
    Medals 0

    newton's method :D

    • 2 years ago
  56. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    ok then how is it easy to approximate?

    • 2 years ago
  57. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    Its easy you don't even need to think, lol

    • 2 years ago
  58. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    what?

    • 2 years ago
  59. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    it didnt look easy on wolfram

    • 2 years ago
  60. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    sam , so are you going to post the solution or not. cuz im getting really tired

    • 2 years ago
  61. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    you can use a calculator for this. is that your 'easy' solution ?

    • 2 years ago
  62. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    you have to graph it for 7.3^(x-1) and 3^(x+1)-5 pick some points

    • 2 years ago
    1 Attachment
  63. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    what program do you use to graph that?

    • 2 years ago
  64. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    its a tedious job though, but if you have a graphing calc, it will be fine

    • 2 years ago
  65. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    then why do you say its easy?

    • 2 years ago
  66. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    http://www.wolframalpha.com/input/?i=7.3^%28x-1%29%2B5-3^%28x%2B1%29%3D0

    • 2 years ago
  67. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    what do you mean , pick some points? estimate

    • 2 years ago
  68. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    yes , estimate

    • 2 years ago
  69. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Newtons Method i think..

    • 2 years ago
  70. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont think so, its just approximation problem

    • 2 years ago
  71. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    then what else?

    • 2 years ago
  72. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    anyways, the question seemed pretty ambiguous. i didnt know what they meant by 'easy'

    • 2 years ago
  73. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    lol, thats all? guessing?

    • 2 years ago
  74. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    you can use this program to graph https://www.desmos.com/calculator/c

    • 2 years ago
  75. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    then you do screen capture?

    • 2 years ago
  76. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    sigh..you can state your question as finding the approximation than 'solve for x'

    • 2 years ago
  77. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    @Mimi_x3 yes its a bit of disappointing, but I'll come up with a new question later :)

    • 2 years ago
  78. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    @perl no i dont screen cap on that software

    • 2 years ago
  79. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    lol, i wanted to see a solution..but there is no solution *sigh*

    • 2 years ago
  80. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    the solution is approximation ,lol

    • 2 years ago
  81. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    like the working out..

    • 2 years ago
  82. .Sam.
    Best Response
    You've already chosen the best response.
    Medals 4

    Nevermind I'll come up a new one :)

    • 2 years ago
  83. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Alright, please state your question correctly next time.

    • 2 years ago
  84. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    so you copy as a file

    • 2 years ago
  85. perl
    Best Response
    You've already chosen the best response.
    Medals 0

    I think there is a confusion, he copied the problem originally with multiplication 7*3^(x-1)

    • 2 years ago
  86. apoorvk
    Best Response
    You've already chosen the best response.
    Medals 0

    c'mon i got the approximate thing using 'jugaad' :/

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.