Respostas

2013-08-09T11:44:33-03:00
Resolvendo:
(2a+3)²+(a-5)²
4a² + 2 * 2a * 3 + 9 + a² - 2a * 5 + 25
4a² + 12a + 9 + a² - 10a + 25
5a² + 2a + 34
1 5 1
2013-08-09T16:06:55-03:00
(2a+3)2+(a-5)2= 
2.2a=4a; 2.3=6; 2.a= 2a; 2.-5= -10
Resposta
4a+6+2a-10= 6a-4
2 3 2