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

hiralpatel121

Can someone help me solve this calc problem? It's attached.

  • one year ago
  • one year ago

  • This Question is Closed
  1. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    • one year ago
  2. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Sample problem:

    • one year ago
  3. myko
    Best Response
    You've already chosen the best response.
    Medals 0

    you have the solution with the explanation, so what else do you need?

    • one year ago
  4. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    I have a sample problem. I've tried applying the steps to the actual problem but it's confusing.

    • one year ago
  5. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    So instead of substituting 6 and 1 into the v's, you'll substitute 5 and 2.

    • one year ago
  6. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    The substitution takes place at the part where the expression is in square brackets. [ ]

    • one year ago
  7. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    You'll plug in 5 first and evaluate. Keep that answer on the side somewhere. Then you'll go back to the square brackets again, plug in 2 and evaluate. Whatever you get as the answer, you'll subtract that from the answer you got when you plugged in 5.

    • one year ago
  8. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Can you wait while I do it, and tell me if it's correct?

    • one year ago
  9. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes.

    • one year ago
  10. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    I got 77.5 when I plugged in 5.

    • one year ago
  11. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    I got -7.5

    • one year ago
  12. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    There's an extra negative sign next to the red negative sign. Ignore the extra one.

    • one year ago
  13. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    \[{-3(5)^{2}\over 2}+6(5)\]

    • one year ago
  14. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay, so if I plug in 1, I'll get -3/2+8 = 6.5

    • one year ago
  15. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    No. 4.5.

    • one year ago
  16. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Look at the equation I wrote above.

    • one year ago
  17. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    What do you get when you evaluate that expression?

    • one year ago
  18. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh, I forgot to square it.

    • one year ago
  19. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Then I get: (-7.5+4.5) - (-3/2 +8) = -9.5 or -19/2.

    • one year ago
  20. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    It's cool.

    • one year ago
  21. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    It's not correct though.

    • one year ago
  22. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    You're doing more than what it's asking for. The only values you're evaluating are 5 and 2. Not 6 and 1.

    • one year ago
  23. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    6 and 1 are solely used in the example.

    • one year ago
  24. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    You never answered my question. What do you get when you evaluate the expression I wrote above?

    • one year ago
  25. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    -7.5

    • one year ago
  26. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Awesome. Now imagine the 5 is gone and a 2 is in its place in the expression above. What do you get now?

    • one year ago
  27. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Replace BOTH 5s with 2s. Not just the one on the left.

    • one year ago
  28. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    6

    • one year ago
  29. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Perfect. Now the last step is subtracting that 6 from -7.5: -7.5 - 6 =

    • one year ago
  30. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    -13.5

    • one year ago
  31. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Awesome : )

    • one year ago
  32. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    But if you look at the sample problem, they subtracted another part too.

    • one year ago
  33. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    They subtracted the value of the expression when a 1 was plugged in. We subtracted the value of the expression when a 2 was plugged in.

    • one year ago
  34. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    I got -8 and it's still wrong.

    • one year ago
  35. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    -8 on which problem?

    • one year ago
  36. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Ugh. It's + 8 not +6

    • one year ago
  37. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    \[{-3v ^{2} \over 2}+8v\]

    • one year ago
  38. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Answer: -7.5 or -15/2

    • one year ago
  39. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay

    • one year ago
  40. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Sorry. I thought the expressions were the same in the example and actual problems.

    • one year ago
  41. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    It's okay. Can you help with another problem?

    • one year ago
  42. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    If you're not busy?

    • one year ago
  43. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Sure.

    • one year ago
  44. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    • one year ago
  45. hiralpatel121
    Best Response
    You've already chosen the best response.
    Medals 0

    Sample:

    • one year ago
  46. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    4/3

    • one year ago
  47. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Start off exactly as the example starts by dividing u and -4 by the square root of u. This gives you: \[\int\limits_{1}^{9}u ^{1/2}-4u ^{-1/2}\]

    • one year ago
  48. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Then integrate each term.

    • one year ago
  49. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    \[[{2 \over 3}u ^{3/2}-8u ^{1/2}]\]

    • one year ago
  50. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Plug in 9 first, and evaluate. Plug in 1 afterwards, then evaluate. Subtract the second answer from the first one.

    • one year ago
  51. coreylvaughn
    Best Response
    You've already chosen the best response.
    Medals 1

    Take care and don't forget to mark a Best Response. Thank you

    • one year 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.