Respostas

2013-09-29T14:27:40-03:00
X² + x = 12
x² + x - 12 = 0

A = 1
B = 1
C = -12

Usa-se Bhaskára :

 Δ =b² - 4ac
 Δ =1² - 4. 1. -12
 Δ =1 + 48
 Δ =49

 -b +- Δ / 2a
-1 +  Δ49 / 2.1
-1 + 7 / 2 
6 / 2
3

-1 -  Δ49 / 2.1
-1 - 7 / 2.1
-8 / 2.1
-8/2
-4