2.
[tex]a) \ (x^{2}+3x-2y^{2})(2x^{2}-5y) =\\\\= x^{2}\cdot2x^{2}+x^{2}\cdot(-5y) +3x\cdot2x^{2}+3x\cdot(-5y) -2y^{2}\cdot2x^{2}-2y^{2}\cdot(-5y)=\\\\=2x^{4}-5x^{2}y+6x^{3}-15xy -4x^{2}y^{2}+10y^{3}[/tex]
[tex]b) \ (6x^{2}y^{2}+4xy)(5xy^{2}-2y)=\\\\=6x^{2}y^{2}\cdot5xy^{2}+6x^{2}y^{2}\cdot(-2y) +4xy\cdot5xy^{2}+4xy\cdot(-2y)=\\\\=30x^{3}y^{4}-12x^{2}y^{3}+20x^{2}y^{3}-8xy^{2}=30x^{3}y^{4}+8x^{2}y^{3}-8xy^{2}[/tex]
3.
Stopień wielomianu to najwyższa potęga x-a w tym wielomianie.
a) st. w(x) = 5
b) st. w(x) = 7
c) st. w(x) = 7
