If f(x) = x2 - 10x + 25, then the derivative at x = 5 is

f(x)=x2-10x+25 =x-52 =x-5f is not diff. at x=5

f(x)=x2-10x+25 =x-52 =x-5f is not diff. at x=5

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If $f (x) = \sqrt{x^{2} - 10 x + 25}$ , then the derivative at x = 5 is

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does not exist

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$f (x) = \sqrt{x^{2} - 10 x + 25} = \sqrt{{(x - 5)}^{2}} = |x - 5|$

f is not diff. at $x = 5$

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