Use the Law of Cosines:

For any $ΔABC$:
$a^2=b^2+c^2−2bc·\cos(A)$

$x\approx33.752$

Use the Law of Sines:

For any $ΔABC$:

$\frac{\sin A}{a} = \frac{\sin B}{b} = \frac{\sin C}{c}$

x$\approx9.663$