Find all values of x where the tangent line is horizontal for the function f (x) = x/x^2+5

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter7: Integration
Section7.1: Antiderivatives
Problem 7YT: YOUR TURN Find an equation of the curve whose tangent line has slope f(x)=3x1/2+4 and passes through...
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Find all values of x where the tangent line is horizontal for the function f (x) = x/x^2+5

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why is it f'(x)=(x^2+5)(1)-x(2x)/(x^2+5)^2 

where did the (1) and 2x come from in the numerator? please explain

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ISBN:
9780321964038
Author:
GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:
Pearson Addison Wesley,