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onegirl

  • 2 years ago

Evaluate the definite integral.

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  1. onegirl
    • 2 years ago
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  2. skylarxoxoxo
    • 2 years ago
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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

  3. skylarxoxoxo
    • 2 years ago
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    and solve it that way

  4. Loser66
    • 2 years ago
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    @onegirl do you have any idea?

  5. onegirl
    • 2 years ago
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    am i just going to substitute u or?

  6. Loser66
    • 2 years ago
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    yes, which one? u =?

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

  8. onegirl
    • 2 years ago
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    is du the derivative of it? or

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

  10. onegirl
    • 2 years ago
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    ok

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

  12. onegirl
    • 2 years ago
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    okay i'll try it t

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

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

  15. Loser66
    • 2 years ago
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    got it?

  16. onegirl
    • 2 years ago
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    okay

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

  18. Loser66
    • 2 years ago
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    do you know what I am doing?

  19. onegirl
    • 2 years ago
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    hmmm no

  20. Loser66
    • 2 years ago
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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?

  21. onegirl
    • 2 years ago
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    yes

  22. onegirl
    • 2 years ago
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    so u will be 0 too right?

  23. onegirl
    • 2 years ago
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    Me? I live in USA

  24. Loser66
    • 2 years ago
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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

  25. onegirl
    • 2 years ago
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    ok lol my bad

  26. Loser66
    • 2 years ago
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    |dw:1368223122327:dw|

  27. Loser66
    • 2 years ago
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    calculate it and tell me the answer

  28. Loser66
    • 2 years ago
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    |dw:1368223207231:dw|

  29. onegirl
    • 2 years ago
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    umm 5?

  30. Loser66
    • 2 years ago
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    perfect! now replace

  31. Loser66
    • 2 years ago
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    |dw:1368223296128:dw|

  32. onegirl
    • 2 years ago
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    ok

  33. Loser66
    • 2 years ago
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    you go girl!!! can step up from here?

  34. onegirl
    • 2 years ago
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    so now i find the integral or?

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

  36. onegirl
    • 2 years ago
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    noo is that a sqrt sign?

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

  38. onegirl
    • 2 years ago
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    okay

  39. Loser66
    • 2 years ago
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    so, what's the answer?

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

  41. Loser66
    • 2 years ago
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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.

  42. Loser66
    • 2 years ago
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    |dw:1368223960531:dw|

  43. Loser66
    • 2 years ago
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    |dw:1368224029766:dw| that's the final one

  44. onegirl
    • 2 years ago
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    ohhh okay

  45. Loser66
    • 2 years ago
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    glad to hear that.

  46. onegirl
    • 2 years ago
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    thanks!

  47. Loser66
    • 2 years ago
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    yw

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