Respostas

2014-08-11T16:15:43-03:00
(3x+5)²=49
(3x+5)*
(3x+5)= 49
9x²+15x+15x+10-49=0
9x²+30x-39=0
A= 9
B= 30
C= -39
X= -30 +-√(30)²-4*9*-39 / 2*2
X= -30 +- 
√2,304 / 4
X= -30 +-48 / 4    
X1= -30 + 48 / 4
X1= 18 /4
X1= 4.5
X2= -30 - 48 / 4
X2= -78 / 4 
X2= -19.5
os numeros são 4.5 e -19.5
espero ue tenha ajudado