Question

Rápido, me ajudem, e p hj

Answer 1

1) (x+9)² = (x²+2.9.x+9²=x²+18x+81

2) (x-9)²=x²-18x+81

3)(x+9).(x-9)= x²-9x+9x-9²=x²-81

4)(3+4)²= (3x)²+2.(3x).4+(4)²=9x²+24x+16

5)(3x-4)²=9x²-24x+16

6)(3x+4).(3x-4)=(3x)²+(3x).(-4)+4.(3x)-(4)²=9x²-12x+12x-16=9x²-16

7)(1+10y)²=(1)²+2.1.(10y)+(10y)²=1+20y+100y²

8)(1-10y)²=(1)²+2.(-10y)+(-10y)²=1-20y+100y²

9)(1+10y).(1-10y)=(1)²-1.10y+10y.1-(10y)²=1-10y+10y-100y²=1-100y²

10)(x+1/9y)²=x²+2.x.y.1/9+(1/9)²=x²+(2/9).x.y+(1/81).y²

11)((x-1/9.y)²= x²-(2/9).x.y+(1/81).y²

12)(x+1/9.y).(x-1/9y)=x²-(1/9)x.y+(1/9).x.y-(1/9)².y²=x²-(1/81).y²

13)(y+z+10)²=(y+z)²+2.10.(y+z)+10²=y²+2y.z+z²+20y.z+100

14)(y+3z+2x)²=(y+3z)²+2.(2x).(y+3z)+(2x)²=y²+6y.z+9z²+4x.y+4x.z+4x²

15)(5x+1/2z)²=(5x)²+2.5x.(1/2).z+(1/2)².z²=25x²+5x.z+(1/4)z²

16)(5x-1/2z)²=25x²-5x.z+(1/4).z²

17)(5x+1/2z).(5x-1/2z)=(5x)²-(5x).(1/2)z+5x.(1/2)z-(1/2)².z²=25x²-(1/4)z²

18)(4x+1/2z)²=(4x)²+2.4x.1/2z+(1/2)².z²=16x²+4xz+(1/4).z²

19)(4x-1/2z)²=16x²-4x+(1/4)z²

20)(4x+1/2z).(4x-1/2z)=(4x)²-4x.1/2z+4x.1/2z-(1/2)².z²=16x²-(1/4)z²