Respostas

2014-04-17T10:30:00-03:00
F(x) = x² - x - 12
delta = 1 + 4*12 = 49
x' = (1+7)/2 ==> x' = 4
x" = (1-7)/2 ==> x" = -3
a+1 = 4 ==> a = 3
a+1 = -3 ==> a = -4
resp : a = 3 ou a = -4