Respostas

2013-10-22T11:06:21-02:00
2013-10-22T11:15:03-02:00
(X + 5) . (X - 2)     +   (2X - 1) . (x + 1)

=x² -2x + 5x -10     +    2x² + 2x -x -1
=3x² +4x -11