Respostas

2013-10-17T21:15:46-03:00
X² - 3x - 10
Delta = b² - 4.a.c
Delta = (-3)² - 4.(1).(-10)
Delta = 9 + 40 = 49

X =  (- b + - raiz ( delta) ) / 2.a

x = -(-3) +- 7  / 2.1
x = 3 +- 7  / 2

x¹ = 5
x² = -2