Respostas

2013-07-02T20:27:06-03:00

(x+2)² = x²+4x+4

(x-2y)²=x²-4yx+4y²

x²-1= x= raiz de 1= x=1

(x+4)²=x²+8x+16

 

(x+1)(x-1)=x²-x+x-1=x²-1=x=1

x²-25 = x²=25 x=5

(x-3)² = x²-6x+9

 

 

3 4 3