Respostas

2014-05-25T18:47:48-03:00
1) (x+6)(x-2)+4x=(2x-1)²
Distributiva...
x²-2x+6x-12+4x=(2x-1)(2x-1)
x²+8x-12=4x²-2x-2x+1
x²-4x²+8x+4x-12-1=0
-3x²+12x-13=0

2)3x(x-2)=1+3x²
Distributiva...
3x²-6x-1-3x²=0
-6x-1=0
x= -1/6