Respostas

2014-02-16T10:59:51-03:00
Resposta

Δ = b² - 4ac
Δ = -4² - 4.4.5
Δ = 16 - 80
Δ = -64

x = -b +- √Δ /2a
x = -(-4) +- √-64 /2.4
x = 4 +- √64 . (-1) /8
x = 4 +- √64i² /8
x = 4 +- 8i /8
x = 4 + 8i /8
x = 1 + 2i /2

X = 1 + 2i /2  ou x = 1 - 2i/2
1 5 1