Factor each expression below completely.

1. $x^{2} − 2x − 63$

   Hint (a):

   Try to think of two factors of $63$ that have a difference of $2$.

   More Help (a):

   Notice that the constant, $−63$, is negative.

   Answer (a):

   $\left(x − 9\right)\left(x + 7\right)$

2. $2x^{2} − 5x −12$