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x² +2x -x -2 = 2x² + 8x -3x -12
x² +x -2 = 2x² +5x -12
x² + x -2x² -5x -2 + 12 = 0
-x² -4x +10 = 0
Δ = (-4)² -4*(-1)*10 = 16 + 40 = 56
√Δ = √56 = √4*√14 = 2√14
x1 = [-(-4) -2√14] : [2*(-1)] = (4 -2√14) : (-2) = -2 +√14
x2 = [-(-4) +2√14] : [2*(-1)] = (4 +2√14) : (-2) = -2 -√14