4x^2 + 9x^3 + 9xy + 7xyz + 3z^2 + 9
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2. x^2 + 2x + 3) ( x + y) = x^3 +2x^2 + 3x +x^2y +2xy + 3y
3. 2x^2 + 3x^3 + 6xy + 7xyz + 2x^2+3z^2+6x^3+3xy+8+1=
4x^2 + 9x^3 + 9xy + 7xyz + 3z^2 + 9