you are right what you are doing.
after you simplfy you get:
well we need to rearrange it a little bit, so we get:
then using the Quadratic equation
we sub in the numbers,
then again simplfy:
so we get t=1 or t=0
if t=0 x=0
if t=1 x=2 or 0.
hope this helps. correct me if im wrong anyone.