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se considera functia f: R\{-1}-R f(x) = x^2 / x+1 sa se calculeze derivata functiei f

Răspuns :

[tex]f^{'}(x)=\left(\dfrac{x^2}{x+1}\right)^{'}=\dfrac{(x^2)^{'}\cdot (x+1)-x^2\cdot(x+1)^{'}}{(x+1)^2}=\\\\=\dfrac{2x\cdot (x+1)-x^2\cdot 1}{(x+1)^2}=\dfrac{x^2+2x}{(x+1)^2}.[/tex]

Green eyes.