Respostas

2014-04-08T15:53:49-03:00
X² - 15x = 0
x(x - 15) = 0
x' = 0
x'' =                x - 15 = 0 
x'' =                   x = 15
2014-04-08T16:08:50-03:00
X(x-15)=0

x1=0

x-15=0
x=15
logo x2=15

S={0,15}