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onegirl

Evaluate the definite integral.

  • 11 months ago
  • 11 months ago

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  1. onegirl
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    • 11 months ago
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  2. skylarxoxoxo
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    go into this site callec web 2.0 calc it type the problem into the calculator and BAM theres the answer! :) or better yet, get out paper and actually write out the problem

    • 11 months ago
  3. skylarxoxoxo
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    and solve it that way

    • 11 months ago
  4. Loser66
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    @onegirl do you have any idea?

    • 11 months ago
  5. onegirl
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    am i just going to substitute u or?

    • 11 months ago
  6. Loser66
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    yes, which one? u =?

    • 11 months ago
  7. Loser66
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    try u = x^2 +1 then du =?

    • 11 months ago
  8. onegirl
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    is du the derivative of it? or

    • 11 months ago
  9. Loser66
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    yes!! try, if you make some mistake, i correct it then, but the most important is trying!!

    • 11 months ago
  10. onegirl
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    ok

    • 11 months ago
  11. Loser66
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    don't worry, I dare not say anything further, but to this problem, I am ok

    • 11 months ago
  12. onegirl
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    okay i'll try it t

    • 11 months ago
  13. onegirl
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    okay for the derivative i got 2x

    • 11 months ago
  14. Loser66
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    2xdx girl. ok, let put it in neat du = 2x dx , right?

    • 11 months ago
  15. Loser66
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    got it?

    • 11 months ago
  16. onegirl
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    okay

    • 11 months ago
  17. Loser66
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    ok, now, we change the limit, have to. tell me, if x =0, u =?

    • 11 months ago
  18. Loser66
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    do you know what I am doing?

    • 11 months ago
  19. onegirl
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    hmmm no

    • 11 months ago
  20. Loser66
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    ok, let me explain. Originally, you have x, dx and limits respect to x then, you change (substitute) to u, so, dx must change to du and limits must follow u, right?

    • 11 months ago
  21. onegirl
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    yes

    • 11 months ago
  22. onegirl
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    so u will be 0 too right?

    • 11 months ago
  23. onegirl
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    Me? I live in USA

    • 11 months ago
  24. Loser66
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    ok, take step!! forget my question, I thought you don't understand what I mean so, made that question to find out another way for you to come up the problem, now, you got it, no need more . take a look

    • 11 months ago
  25. onegirl
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    ok lol my bad

    • 11 months ago
  26. Loser66
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    |dw:1368223122327:dw|

    • 11 months ago
  27. Loser66
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    calculate it and tell me the answer

    • 11 months ago
  28. Loser66
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    |dw:1368223207231:dw|

    • 11 months ago
  29. onegirl
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    umm 5?

    • 11 months ago
  30. Loser66
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    perfect! now replace

    • 11 months ago
  31. Loser66
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    |dw:1368223296128:dw|

    • 11 months ago
  32. onegirl
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    ok

    • 11 months ago
  33. Loser66
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    you go girl!!! can step up from here?

    • 11 months ago
  34. onegirl
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    so now i find the integral or?

    • 11 months ago
  35. Loser66
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    am I rude when saying that? sorry if you feel so, or I take it back?

    • 11 months ago
  36. onegirl
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    noo is that a sqrt sign?

    • 11 months ago
  37. Loser66
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    yep, from the beginning until now, we don't "substitute " that sqrt, so it's there still

    • 11 months ago
  38. onegirl
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    okay

    • 11 months ago
  39. Loser66
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    so, what's the answer?

    • 11 months ago
  40. onegirl
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    so i got (2 u^(3/2))/3+C

    • 11 months ago
  41. Loser66
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    something wrong there, 1st you forgot 1/2 from du, and it cancel out with your 2/3 to get 1/3 only 2nd, it has a limits so, you have to replace those limit where you have u.

    • 11 months ago
  42. Loser66
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    |dw:1368223960531:dw|

    • 11 months ago
  43. Loser66
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    |dw:1368224029766:dw| that's the final one

    • 11 months ago
  44. onegirl
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    ohhh okay

    • 11 months ago
  45. Loser66
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    glad to hear that.

    • 11 months ago
  46. onegirl
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    thanks!

    • 11 months ago
  47. Loser66
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    yw

    • 11 months ago
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