Respostas

2014-05-20T10:07:12-03:00
B) (2x-1)²+(x+3)(x-3)
  =  (2x-1)(2x-1)+(x+3)(x-3)
    =4x
²-2x-2x+1+x²-3x+3x-9
    =5x²-4x-8=

1 2 1