Respostas

2014-07-15T09:04:32-03:00
X(x - 1) - 60 = 60 + x
x² - x - 60 = 60 + x
x² - x - 60 - 60 - x = 0
x² - 2x - 120 = 0
Δ = (-2)² - 4.1.(-120)
Δ = 4 + 480
Δ = 484
√Δ = 22

x =  \frac{-(-2) + ou - 22}{2}
x =  \frac{2 + ou - 22}{2}
x' =  \frac{2  + 22}{2}
x' =  \frac{24}{2}
x' = 12

x'' =  \frac{2-22}{2}
x'' =  \frac{-20}{2}
x'' = -10

V = {-10,12}
Abraços.