Respostas

2014-07-30T23:48:45-03:00
Δ = b² - 4* ac
Δ = (-7)² - 4*1*6
Δ = 49 - 24
Δ = 25

x = -b ± √Δ / 2*1
x = -(-7) ± √25 / 2*1
x1 = 7 + 5 / 2 = 6
x2 = 7 - 5 / 2 = 1
S = {6,1}