Respostas

2013-04-14T19:41:28-03:00

a) x²-81

(x-9) . (x+9)

 

b)4x²-36

(2x-6) . (2x+6)

 

c)4x²-12xy+9y²

(2x -3y).(2x-3y)

 

 

1 5 1
2013-04-14T19:48:25-03:00

x2=81

x=9

 

  4x2=36

x2=36/4

x2=9

x=3

    

4x²-12xy+9y² = (2x - 3Y)²