Which two values of x are roots of the polnomial below?

Plug in the numbers into the formula opposite b plus or minus the square root of b^2 -4(a)(c) all over 2(a) 
6+or - square root 6^2 -4(4)(1) all over 8
the answer choices are 6+ square root 20 over 8 and 6-square root 20 over 8
Sorry I can't figure out how to type it out better for you without all the symbols I need. 
A and D

Try d cause last i guessed that and it was right

Iam guessing c. or d.