Respostas

2014-05-07T01:38:19-03:00
A - fica (x²+2).(x-2)=(x-2).(3x)
       x³-2x²+2x-4=3x²-6x
       x³-2x²+2x-4-3x²+6x
       x³-5x²+8x-4