Respostas

2014-05-15T16:35:33-03:00
(x+1)² = 7+x
x²+2x+1² = 7+x
x² +2x -x +1 -7 = 0
x² + x -6 = 0

Δ= 1 -4.1.(-6)
Δ= 1 +24
Δ= 25

√25 = 5

x' = -1+ √25 / 2 -----> x' = -1 + 5 / 2 x' = 2
x"= -1 - √25 / 2 ------>x" = -1 - 5 / 2 x" = -3
2 5 2