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# C3 Differentiation question :/ Watch

1. I don't understand why I can't get this right.

Given that y = 1/(4x+1)^2 find the value of dy/dx at (1/4,1/4)

Do I open the brackets or do I differentiate the two functions?

2. y=1/(4x+1)^2=(4x+1)^-2 which you can differentiate using the chain rule u=4x+1
then one you have dy/dx just sub in x and there's your answer
3. (Original post by Jonario)
I don't understand why I can't get this right.

Given that y = 1/(4x+1)^2 find the value of dy/dx at (1/4,1/4)

Do I open the brackets or do I differentiate the two functions?

Chain rule?
Note that . If you can't do it by recognition, let so . Then find and and note that .
4. (Original post by Farhan.Hanif93)
Chain rule?
Note that . If you can't do it by recognition, let so . Then find and and note that .
Thanks, my teacher taught me different way of finding dy/dx, the only problem i had was identifying that 1/(4x+2)^2 was (4x+2)^-2

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Updated: December 2, 2010
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