Question

Preciso de ajuda urgente é pra amanhã

Efetue:
a) (x+1)(x-1)+(x+2)(x-2)
b) (x+y)²-(2x+2y)²+(3x+3y)²
c) (x+y)(x-y)+(x-y)²-(x+y)²

Answer 1

+A)(X+1).(X-1)+(X+2).(X-2)=0

X2-X+X-1+X2-2X+2X-4=0

X2+X2-X+X-1-4=0

2X2-5=0

2X2=5

X2=5/2

X=RAIZ DE 5/2.

B)(X+Y)2-(2X+2Y)2+(3X+3Y)2

X2+2.X.Y+Y2-(2X)2+2.2X.2Y+(2Y)2+(3X)2+2.3X.3Y+(3Y)2

X2+2XY+Y2-4X2+8XY+4Y2+9X2+18XY+9Y2

X2-4X2+9X2+Y2+4Y2+9Y2+2XY+8XY+18XY

10X2-4X2+10Y2+4Y2+10XY+18XY

6X2+14Y2+28XY/2

3X2+7Y2+14XY

C)(X+Y).(X-Y)+(X-Y)2-(X+Y)2

X2-XY+XY-Y2+(X-Y).(X-Y)-(X+Y).(X+Y)

X2-XY+XY-Y2+X2-XY-XY+Y2-X2+XY+XY+Y2

X2+X2-X2-Y2+Y2+Y2-XY+XY-XY-XY+XY

X2+Y2-XY