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# C3 Differentiation help

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1. Hi guys
im doing this paper
http://www.mei.org.uk/files/papers/C3_2014_June.pdf

Im trying to differentiate the function in question 8 - where fx = x/(2+x^2)^-0.5
When using the quotient rule, my 'u' would be x. But would my v be rt(2+x2)
or v= (2+x^2)^-0.5 ????
slightly confused

thanks for help
2. The beauty of the quotient rule is that you can avoid differentiating negative powers.

So your v = denominator = √(2+x^2)
3. (Original post by starwarsjedi123)
Hi guys
im doing this paper
http://www.mei.org.uk/files/papers/C3_2014_June.pdf

Im trying to differentiate the function in question 8 - where fx = x/(2+x^2)^-0.5
When using the quotient rule, my 'u' would be x. But would my v be rt(2+x2)
or v= (2+x^2)^-0.5 ????
slightly confused

thanks for help
Just rt(2+x^2), the quotient rules takes the minus sign into account for you.

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