Respostas

2013-09-04T17:49:57-03:00
2013-09-04T18:37:09-03:00
X² +x-30=0

delta= b² - 4 . a .c
delta = 1² - 4 . 1. (-30)
delta = 1 + 120
delta = 121

X= -b +- raíz de delta/ 2a

x= -1+- 11/2

x= 12/2 = 6

x'+ -10/2 = -5