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anyone good at maths help plz.
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Narnia
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Posted on 11-26-09 1:29
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hey guys, I need a little help solving few questions from business mathematics.It is about differentiation and implicit differentiation, so if any body got some knowledge on this, Please help..I would really appreciate this. the question like this:: Evaluate dy/dt for the function at the point. x 3 + y 3 = 9; dx/dt = -3, x = 1, y = 2 [Disallowed String for - script not allowed] type="text/javascript"> formCheckList.addElement(new Check_Answer({ref_label:"1",name:"mc-ans-_42615512_1"})); [Disallowed String for - script not allowed] type="text/javascript"> formCheckList.addElement(new Check_Answer({ref_label:"1",name:"mc-ans-_42615512_1"}));
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syal
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Posted on 11-26-09 1:58
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Evaluate dy/dt for the function at the point. x3 + y3 = 9; dx/dt = -3, x = 1, y = 2
Differentiating with respect to t on both sides; d(x^3 + y^3)/dt = d(9)/dt dx^3/dt + d y^3/dt = 0
Applying chain rule; (dx^3/dx)*(dx/dt) + (dy^3/dy)*(dy/dt) =0; (3x^2)* (-3) + (3y^2)*(dy/dt) = 0 (3*1) * (-3) + (3* 4) * (dy/dt) = 0 -9 + 12 * (dy/dt) = 0 12(dy/dt) = 9 dy/dt =9/12 = 3/4
I hope it helps.... ("^' means "to the power")
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Narnia
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Posted on 11-26-09 2:16
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thanks a lot...didnt expect that quick but,,i really do appreciate that.. you must be very good at maths... well man,,,i suck at maths...and i am taking this online class....i am really struggling to at least pass this course.......... well,,thanks again...hope you dont mind if have to ask another one some other time....:)
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jptsamachar
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Posted on 11-26-09 8:56
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hoina class nai jaane garya chaina ni kya ho...yeti sajilo pani na-aayeko....this is a very basic problem from differetiation... If you are skipping classes...pls dont....you are the one who pays for the college...not your boring professor..
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pyaradeshbasiharu
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Posted on 11-26-09 9:00
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