Respostas

2014-01-28T13:10:44-02:00
Δ = b² -4ac
Δ = (-3)² -4 *1 * (-4)
Δ = 9 + 16
Δ = 25
x' = (-b + √∆)/ 2a
(-(-3) + 5)/2 * 1
(3 + 5)/2
8/2
4
x'' = (-b - √∆)/ 2a
(-(-3) - 5)/2 * 1
(3 - 5)/2
-2/2
-1

S={-1,4}
1 4 1