onegirl
Evaluate the definite integral.
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onegirl
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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
skylarxoxoxo
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and solve it that way
Loser66
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@onegirl do you have any idea?
onegirl
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am i just going to substitute u or?
Loser66
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yes, which one? u =?
Loser66
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try u = x^2 +1 then du =?
onegirl
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is du the derivative of it? or
Loser66
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yes!! try, if you make some mistake, i correct it then, but the most important is trying!!
onegirl
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ok
Loser66
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don't worry, I dare not say anything further, but to this problem, I am ok
onegirl
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okay i'll try it t
onegirl
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okay for the derivative i got 2x
Loser66
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2xdx girl. ok, let put it in neat du = 2x dx , right?
Loser66
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got it?
onegirl
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okay
Loser66
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ok, now, we change the limit, have to. tell me, if x =0, u =?
Loser66
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do you know what I am doing?
onegirl
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hmmm no
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?
onegirl
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yes
onegirl
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so u will be 0 too right?
onegirl
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Me? I live in USA
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
onegirl
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ok lol my bad
Loser66
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|dw:1368223122327:dw|
Loser66
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calculate it and tell me the answer
Loser66
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|dw:1368223207231:dw|
onegirl
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umm 5?
Loser66
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perfect! now replace
Loser66
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|dw:1368223296128:dw|
onegirl
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ok
Loser66
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you go girl!!! can step up from here?
onegirl
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so now i find the integral or?
Loser66
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am I rude when saying that? sorry if you feel so, or I take it back?
onegirl
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noo is that a sqrt sign?
Loser66
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yep, from the beginning until now, we don't "substitute " that sqrt, so it's there still
onegirl
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okay
Loser66
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so, what's the answer?
onegirl
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so i got (2 u^(3/2))/3+C
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.
Loser66
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|dw:1368223960531:dw|
Loser66
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|dw:1368224029766:dw|
that's the final one
onegirl
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ohhh okay
Loser66
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glad to hear that.
onegirl
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thanks!
Loser66
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yw