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

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1. `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`

    

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