This is a quadratic formula with a general form of a²x + bx + c = 0. For quadratic equations, we can solve for its two roots using the quadratic formula shown in the attached picture.
a = -3
b = -4
c = -4
x = [-(-4) + √(-4)² - 4(-3)(-4)]/2(-3) = 2 + √-32/2
x = [-(-4) - √(-4)² - 4(-3)(-4)]/2(-3) = 2 - √-32/2