Respostas

2014-08-17T17:16:38-03:00
- X² + 7x - 12 = 0
Δ = 7² - 4 x (- 1) x - 12 = 0
Δ= 49 - 48
Δ= 1
 
X = -b +-√Δ/ 2a
X' = - 7 + 1/ 2 >>>  -6/2 >>> -3
X'' = -7 -1/2 >>> -8/2 >>> -4