Respostas

2014-07-22T16:39:55-03:00
2x(x+1) = x(x+5) + 3 (12-x)
2x² + 2x = x² + 5x + 36 - 3x
2x² - x² + 2x + 3x - 5x = 36
x² = 36
x = √36
x = 6

6x² -x -5 = 0
Δ= -1² +120
Δ= 121
x= 1+-11
        12
x¹=12/12 = 1
x²= -10/12 = -5/6
1 5 1