1) -2x^2 - 2x + 5 = -x^2 - x - (1+x^2)
-2x^2 - 2x + 5 = -x^2 - x - 1 - x^2
-2x^2 - 2x + 5 = -2x^2 - x - 1
- 2x^2 + 2x^2 - 2x + x + 5 +1 = 0
-x + 6 = 0
- x = - 6
x = 6
2) - 2x^2 +3x - 4 = -x^2 - x + (2 - x^2)
- 2x^2 +3x - 4 = - x^2 - x +2 - x^2
-2x^2 + 3x - 4 + x^2 + x - 2 + x^2 = 0
4x - 6 = 0
4x = 6
x = 6/4
x = 1,5