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 where is my mistake ?
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Posted on 02-28-11 12:21 PM     Reply [Subscribe]
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1) A normal line to the graph of a function f at the point (x,f(x)) is defined to be the line perpendicular to the tangent line at that point . Find the equation of the normal line to the curve  y= ³√x² at the point where x=3
Solution:
the point is (3, 3 2/3).................. [
³√3²=3 2/3]
Now for slope m,
dy/dx=d(x2/3)/dx= 2/3 x-1/3
at poin x=3
2* 3 -1/3/3= 2/(3* 3 1/3) = 2/3 4/3
The line is perpendicular is m=-3 4/3/2
finally the equation of the normal line is
y-32/3/2=
3 4/3/2(x-3)
y=(-3 4/3/2 )x +3 7/2 +3 2/3







 
Posted on 02-28-11 1:32 PM     [Snapshot: 83]     Reply [Subscribe]
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A simple mathematical error is what I see (happens all the time). See the last step of your calculation. You missed the denominator 2 in the second term.

y-32/3/2=3 4/3/2(x-3)
y=(-3 4/3/2 )x +3 7/2/2 +3 2/3



 
Posted on 02-28-11 1:44 PM     [Snapshot: 117]     Reply [Subscribe]
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ok thanks actually I have not that error in my paper (typing error)
so that is right equation ?

 
Posted on 02-28-11 1:48 PM     [Snapshot: 130]     Reply [Subscribe]
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math to me is like  "kalo ackcheer bhaisi barabar" lol, wow...das ma das jode bis hunchha timro ra mero oth jde kiss hunchh...thats my math right there lol

 
Posted on 02-28-11 1:56 PM     [Snapshot: 144]     Reply [Subscribe]
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1) Find the slope of the tangent (lets say m)
2) The slope of the line perpendicular to the tangent would be -1/m
3) Use the slope in the equation: y-y1 = m(x-x1) at the given points.

Good luck!

 
Posted on 02-28-11 2:02 PM     [Snapshot: 163]     Reply [Subscribe]
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yas , thats i did. But the ans seems like a jokker.

 
Posted on 02-28-11 2:08 PM     [Snapshot: 192]     Reply [Subscribe]
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@Grace_S ,
can you give me rough idea for this question,
when f is defined by f(x)=√x , find a so that f'(a) is three times value of f'(2)
I find f'(2)=1/(2
√2)
so , f'(a)=3/
(2√2)
but I don't know how to find a ? do you have any idea on it?

 
Posted on 03-01-11 8:27 AM     [Snapshot: 499]     Reply [Subscribe]
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@terobaaje :: that is soo gay daju, made my morning though
 
Posted on 03-02-11 12:35 PM     [Snapshot: 712]     Reply [Subscribe]
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comingsoon, did you solve for an 'a'? These kinds of problems are like solving mysteries; the more you do, the better is the fun!

 
Posted on 03-02-11 2:17 PM     [Snapshot: 784]     Reply [Subscribe]
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Is this correct ??

the point is (3, 3 2/3).................. [³√3²=3 2/3]
Now for slope m,
dy/dx=d(x2/3)/dx= 2/3 x-1/3
at poin x=3
2* 3 -1/3/3= 2*(
3 -1/3* 3 -1) = 2*3 -4/3

The line is perpendicular is m=-2-1*3 4/3

finally the equation of the normal line is
y-32/3=
-2-1*3 4/3(x-3)

y =
-2-1*3 4/3 x + 2-1*32/3 +2-1*3 7/3

OR
y=(-3 4/3/2 )x +
3 2/3 +3 7/3/2


 


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