Question:

The area bounded by $y^2 = 9x$, $x = 2$, $x = 4$ and the $x$-axis in the first quadrant is:
(a) $16 - 4\sqrt{2}$ sq. units
(b) $8 - 2\sqrt{2}$ sq. units
(c) $32 - 8\sqrt{2}$ sq. units
(d) $4 - \sqrt{2}$ sq. units