Answer:

1.x³-6x²+12x-8=0

2.27m³+54m²n+36mn²+8n

3.y³−15y²+75y−125

Step-by-step explanation:

1.(x-2)³

(x-2)(x-2)(x-2)=0

(x²-4x+4)(x-2)=0

x³-2x²-4x²+8x+4x-8=0

x³-6x²+12x-8=0

2.(3m+2n)³

=(3m+2n)(3m+2n)(3m+2n)

=3m³+3(3m)²(2n)+3(3m)(2n)²+(2n)³

=27m³+54m²n+36mn²+8n

3.(y−5)³

=(y−5)(y−5)(y−5)

=(y+−5)(y2+−10y+25)

=(y)(y²)+(y)(−10y)+(y)(25)+(−5)(y²)+(−5)(−10y)+(−5)(25)

=y³−10y²+25y−5y²+50y−125

=y³−15y²+75y−125