Respostas

2014-06-09T14:38:05-03:00
Y = ax² + bx + c

y = x² - x - 2

a = 1
b = -1
c = -2

Δ = b² -4ac
Δ = (-1)² - 4(1)(-2)
Δ = 1 + 8
Δ = 9

x = -b +- √Δ /2a
x = 1 +- √9 / 2
x = 1 +- 3 / 2

x' = 4/2 = 2
x'' = -2/2 = -1

Raízes: -1, 2