Respostas

2014-01-12T11:54:12-02:00
(a+2)²=(a+2)(a+2)                          (a-3)²=(a-3)(a-3)
(a+2)²=a²+2a+2a+4                        (a-3)²=a²-3a-3a+9
(a+2)²=a²+4a+4                              (a-3)²=a²-6a+9


(a+2)²+(a-3)²=a²+4a+4+a²-6a+9
(a+2)²+(a-3)²=2a²-2a+13

2014-01-12T12:48:20-02:00
(a + 2)² + (a - 3)²
(a + 2) . (a + 2) + (a - 3) . (a - 3) =
a² + 2a + 2a + 4 + a² - 3a - 3a + 9 =
a² + a² + 2a + 2a - 3a - 3a + 4 + 9 =
2a² + - 2a + 13