Respostas

2014-07-07T08:57:21-03:00
16x² + 40x + 25 = 0
a)16  b) 40  c) 25
Δ = b² - 4ac
Δ = 40² - 4 * 16 * 25
Δ = 1600 - 1600
Δ = 0

x = (-b + √Δ) / 2a
x= -40 / 2 * 16
x= -40 / 32
x = - 5/4
1 4 1
2014-07-07T09:16:03-03:00