2x^3+4x^2=8(x+2)
2x^3+4x^2=8x+16
x^3+2x^2=4x+8
x^3+2x^2-4x-8=0
x^2(x+2)-4(x+2)=0
(x+2)(x^2-4)=0
x+2=0
x^2-4=0
x=-2
x=2
Answer: x1=-2; x2=2
2x^3+4x^2=8(x+2)
2x^3+4x^2=8x+16
x^3+2x^2=4x+8
x^3+2x^2-4x-8=0
x^2(x+2)-4(x+2)=0
(x+2)(x^2-4)=0
x+2=0
x^2-4=0
x=-2
x=-2
x=2
Answer: x1=-2; x2=2