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The question is:

Differentiate the following function:

sqrt(x^2-8x+20)

So far I have gotten

=(x^2-8x+20)^(1/2)

=(1/2)(x^2-8x+20)^(-1/2) * 2x-8

I am unsure where to go from here

I know we are supposed to use the chain rule but I am still confused where to go after this step.

Thanks