3x^2*(x^2-2x+6) X*(y-3)*(y+3) (-2x^5+3x^2-4x^3):2x^2

`3x^2(x^2-2x+6)`

`=3x^(2).x^2+3x^2.(-2x)+3x^(2).6`

`=3x^4-6x^3+18x^2`

`x(y-3)(y+3)`

`=x(y^2-3^2)`

`=x.(y^2-9)`

`=xy^2-9x`

`(-2x^5+3x^2-4x^3):2x^2`

`=(-2x^5:2x^2)+(3x^2:2x^2)-(4x^3:2x^2)`

`=-x^3+3/2-2x`