Solve $x^2+\frac{7}{2}x-3=0$ by completing the square. Give the exact roots in the simplest radical form.

$x=\frac{-14\pm \sqrt{97}}{4}$

$x=\frac{-7\pm \sqrt{97}}{4}$

$x=\frac{-7\pm \sqrt{97}}{8}$

$x=\frac{-7\pm \sqrt{97}}{2}$