Need help finding the derivative
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Need help finding the derivative

[From: ] [author: ] [Date: 11-07-07] [Hit: ]
Heres an image of the question with its possible answers if that helps: http://i.imgur.com/1nq0I.Any help would really be appreciated. Thanks.Ans.......
Given y=f(u) and u=g(x)
find (dy/dx)=f'(g(x))g'(x)

y=u^2 ; u=4x-5


My homework was going just fine until I got to this question. I'm not sure I even know what it's asking. Any ideas?
Here's an image of the question with it's possible answers if that helps: http://i.imgur.com/1nq0I.jpg

Any help would really be appreciated. Thanks. :)

-
dy/dx = dy/du * du/dx

y = u^2 => dy/du = 2u
u = 4x - 5 => du/dx = 4

dy/dx = 2u * 4 = 8u
=8 *(4x - 5)
=32x - 40

Ans. B

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y ' = 2(4x-5)(4)=8(4x-5)
1
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