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Calculus

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Itsbackfliptime
Posts: 18901 - Karma: 75
The area of a rectangle with dimensions x and y is A(xy)=xy. Find the differential of this function.
dA= y dx + x dy

If you measure x=8 and y=6, with a measurement error of +/- 0.47, use the differential to estimate the possible error in the caculated area. (Assume that all expressions are in cm. Do not include units in your answer.)
possible error =

anyone know calc III?
Feb 20 2006 4:36PM
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ATLskier
Posts: 8203 - Karma: 406
eric drinks his own pee





(someone has to get that)
Feb 20 2006 4:43PM
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Pklink04
Posts: 5608 - Karma: 392
im in calc one, and i just started thank you for envokin fear in me. That shits crazy
Feb 20 2006 4:48PM
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Itsbackfliptime
Posts: 18901 - Karma: 75
the first part is solved. I just need the possible error.
Feb 20 2006 5:18PM
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EastCoastPride
Posts: 11654 - Karma: 4,989
billy madison.

and the answer is nullset.
Feb 20 2006 6:17PM
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stinkypoodangle
Posts: 1322 - Karma: 33
just integrate.
Feb 20 2006 6:38PM
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Aseets
Posts: 2171 - Karma: 17
Haha, that totally sounds like, "hey I know of a calculus term, and this is where I get to use it, Just Integrate!"
Feb 20 2006 7:42PM
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MADr.
Posts: 2193 - Karma: 27
damnit wheres my TI-83 so i can do math

i dont see where you even need to use calculus, you just find the area of a rectangle with measurements of 8.47 x 6.47 and subtract the area of the original rectangle (48) from it. then you do the same thing but with a rectangle that is 7.53 x 5.53 and add the two differences.

the top equation just describes product rule for when you take the derivative of a polynomial function.
Feb 20 2006 10:59PM
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Mr_Bojangles
Posts: 2585 - Karma: 16
haha whoa i just started calculus, we've just hit the 'anx^n-1' bullshit to find the equation for the gradient of a function
Feb 21 2006 12:19AM
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dammitmike
Posts: 2530 - Karma: 24
cant help ya man im re-taking calc 2 ugh. just wondering is that for multivariable or differential equations? i gotta take both next semester, oh joy... unless i drop engineering altogether which i may just do.
Feb 21 2006 1:29AM
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freestyler540
Posts: 13106 - Karma: 18,907
Oh shit, my CEGEP stops at Cal II
Feb 21 2006 9:13AM
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waterville_NH
Posts: 3411 - Karma: 23
sorry, im still in pre calc, and i suck at it
Feb 21 2006 9:48AM
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AdSkiAm
Posts: 410 - Karma: 10
be very afraid...it gets worse
Feb 21 2006 10:39AM
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Itsbackfliptime
Posts: 18901 - Karma: 75
it was 8*.47 + 6*.47. Not very hard really.
Feb 25 2006 1:50PM
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awsomecoolguy
Posts: 3536 - Karma: 13
if i dont know the answer to a math problem i always put 5 or x=5 one time on a test i got like 6 points useing the answer 5
Feb 25 2006 8:04PM
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Aseets
Posts: 2171 - Karma: 17
On AP tests if there are multiple parts you and let's say you need the answer for part B to answer part C, you can just make up a number for part B and use it for part C and then still get full credit for part C. At least that's how it works on the physics exam.
Mar 9 2006 11:42PM
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Tasche
Posts: 5422 - Karma: 99
you have to solve it using integration. I remember doing this im pretty sure you have to use an equation or maby you just use the da as the error I dont know look in your calc book.
Mar 10 2006 12:33AM
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MADr.
Posts: 2193 - Karma: 27
so i was right?

um im halfway through a ap calc highschool class. and if thats calc three, you have easy stuff, or im not getting something.
Mar 10 2006 12:39AM
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Petey.
Posts: 5736 - Karma: 4,885
u could always convert to pancakes...pi is 3.14 so pancakes is 2.14...makes sense
Mar 10 2006 10:07AM
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freestylin820
Posts: 483 - Karma: 11
how does that make sense dumbshit
Mar 10 2006 11:06AM
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RedbAss
Posts: 352 - Karma: 10
(2 x error^2) ithink that s right?
Mar 10 2006 11:57AM
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n-o
Posts: 3457 - Karma: 41
III = 8 to the -6
Mar 10 2006 12:02PM
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