If x = √ 3 + √ 2 , then the value of x 3 − 1 x 3 is equal to

 If 

$x=\sqrt{3}+\sqrt{2}$, then the value of $x^3-\frac{1}{x^3}$ is equal to

	A	$21\sqrt{2}$
	B	$42\sqrt{2}$
	C	$22\sqrt{2}$
	D	$21\sqrt{3}$

Solution : C