Respostas

  • Usuário do Brainly
2014-08-13T18:32:18-03:00
(-3)² - 7(-3)-2c=0 
9+21-2c=0
2c=30
c=15
2014-08-13T18:40:50-03:00
X² - 7x - 2c = 0
(-3)² - 7(-3) - 2c = 0
9 + 21 - 2c = 0
30 - 2c = 0
-2c = -30                (-1)
2c = 30
c = 30/2
c = 15