Respostas

2014-03-09T21:59:40-03:00
[b^3 . b^3 + (b^3 . a) - (b^3 . a) - a^2] + [ b^2 . b^2 + (b^2 . a) - (b^2 . a) - a^2] +
[b.b + (b.a )- (b.a) - a^2]

= b^9 + b^4 + b^2 - 3a^2

b=-1 a = -1
=  (-1)^9 + (-1)^4 + (-1)^2 - 3. (-1)^2 = -1 + 1 + 1 - 3 = -2
2 5 2