This doesn't factor well so it is best to use the quadratic equation. Just plug in the numbers.
-b +-√b² - 4ac
-------------------
2a
Plug in the numbers.
-10 +-√10² - 4*4*1
-------------------------
2*4
simplify
-10 +-√84
--------------
8
If you multiply all of this out you come out with your two roots:
x= -.10435
x= -2.39564