Respostas

2014-05-09T10:50:32-03:00
X+(X+2)²=5(X-2)
x + (x
² + 2.x.2 + 2²) = 5.x - 5.2
x + x² + 4x + 4 = 5x -10
x² + (x + 4x -5x) + (4 +10) = 0
x² + 14 = 0

1 5 1
2014-05-09T10:53:45-03:00
x + (x + 2)² = 5 (x - 2)
x + (x + 2) . (x + 2) = 5x - 10
x + x² + 2x + 2x + 4 = 5x - 10
x + x² + 4x + 4 = 5x - 10
x + x² + 4x + 4 - 5x + 10 = 0

x² + 14 = 0
x = √- 14 

2 1 2