Question

simplifique as expressoes:

a) (x+1).(x+2)-2(x+3)² +(x+2).(x+3)

b) (x²+y²) - 2(xy)²

c) (x+1).(x+3)-2(x+2).(x+3)+(x+3)²


POR FAVOR ME AJUDEM

Answer 1

a) (x+1).(x+2)-2(x+3)² +(x+2).(x+3)

 X2+2x+1x+2-(x2+9)+x2+3x+2x+6

X2+3x+2-2x2+18+x2+5x+6

X2-2x2+x2+3x+5x+2+18+6

2x2+8x+26

 

b)(x²+y²) - 2(xy)²

X2+y2-2x-2y

X2-2x+y2-2y

Acho q é assim q se faz

 

c)(x+1).(x+3)-2(x+2).(x+3)+(x+3)²

X2+3x+1x+3-2x+4.x2+9

X2.x2+4x-2x+4+9+3

X2+2x+16