I need to find the derivative of y = sqrt(x-1), using the derivative formula f(x + h) - f(x) / h

At the moment I have sqrt((x+h) -1) - sqrt(x-1) / h

I tried multiplying the top and bottom by the conjugate but it didn't work.

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- April 23rd 2010, 03:37 PMsteezinderivatives
I need to find the derivative of y = sqrt(x-1), using the derivative formula f(x + h) - f(x) / h

At the moment I have sqrt((x+h) -1) - sqrt(x-1) / h

I tried multiplying the top and bottom by the conjugate but it didn't work. - April 23rd 2010, 03:47 PMskeeter
- April 23rd 2010, 03:54 PMsteezin
Thank you so much, turns out I mixed up one of the signs lol