Answer :

[tex]\frac{d( \sqrt{3x^2-7} )}{dx} \\ \frac{1}{2\sqrt{3x^2-7} } \frac{d( 3x^2-7 )}{dx} \\ \frac{6x}{2\sqrt{3x^2-7} } \\ \frac{3x}{\sqrt{3x^2-7} }[/tex]