Use the work shown to find the solutions of the quadratic equation.

-x^2 -x -3/4 =0
-x^2 -x = 3/4
-x^2 -x + [1/2]^2 = 3/4 + [1/2]^2
-x^2 -x +1/4 = 3/4 + 1/4


Which is a solution of x^2 -x -3/4 = 0?
O -1/4
O 1/2
O 3/2
O 3/4