Respostas

2014-08-28T16:16:27-03:00
A) 2X-7=X2-2X+1
2X-X2+2X-1=0
-X2+4X-1=0
X2-4X+1=0

B)5X-1=9X2-12X+4
5X-9X2-1+2X-4=0
-9X2+7X_5=0
9X2-7X+5=0

C)X2-6X+9=2X+5
X2-6X+9-2X-5=0
X2-8X+4=0
1 4 1