Product Rule and Chain Rule Derivative

$\displaystyle\frac{4x^2 - x + 6}{\sqrt{x^2 + 3}}$

$\displaystyle\frac{x}{\sqrt{x^2 + 3}}$

$2\sqrt{x^2 + 3}$

$\displaystyle\frac{2x^2 - x + 3}{\sqrt{x^2 + 3}}$