Find the general solution of the differential equation:

dy/dx = y² + y/(x² + x + 1)

The general solution is given by:

x y + 1 = a (1 - x - y - 2xy)
a. y(x) = (2x - 1 + √(4x² - 4x + 5))/(2x²)
b. y(x) = (2x - 1 - √(4x² - 4x + 5))/(2x²)
c. y(x) = (1 - x + √(1 - 2x + x²))/(x - 1)
d. y(x) = (1 - x - √(1 - 2x + x²))/(x - 1)