Respostas

2014-01-17T10:18:14-02:00
(5x - 6 )² - (5x+4) (5x -4)
25x²-60x+36- (25x²-16)
25x²-60x+36-25x²+16
25x²-25x²-60x+36+16
-60x+52
1 5 1