QUIZ

Question 1/18
Si $f\left(x\right)=\dfrac{2x-1}{x+3}$ alors $f'\left(x\right)=?$
  $\dfrac{-1}{\left(x+3\right)^{2}}$
  $\dfrac{5x+2}{\left(x+3\right)^{2}}$
  $\dfrac{4}{\left(x+3\right)^{2}}$
  $\dfrac{x-3}{\left(x+3\right)^{2}}$