Respostas

2014-01-17T14:00:01-02:00
Simplifique as expressões

(x+1)(x+8)-x(x+9)
x²+8x+x+8-x²-9x
x²-x²+9x-9x+8
8

(x+y)(x-y)+(x+y²)-2xy
x²-y²+x+y²-2xy
x²-y²+y²+x-2xy
x²+x-2xy

(2x+1)²-3(x-2)²-x(x+16)
4x²+4x+1-3(x²-4x+4)- x²-16x
4x²+4x+1-3x²+12x-12-x²-16x
4x²-3x²-x²+4x+12x-16x+1-12
-11

(x+1)²+(x-1)²+(x+1)(x-1)
x²+2x+1+x²+2x+1+x²-1
x²+x²+x²+2x+2x+1+1-1
3x²+4x+1