[tex](x + y)(x - y) + ( x + y) {}^{2} = \\ = {x}^{2} - {y}^{2} + {x}^{2} + 2xy + {y}^{2} = 2 {x}^{2} + 2xy[/tex]
Степень многочлена: 2+1+1 = 4
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[tex](x + y)(x - y) + ( x + y) {}^{2} = \\ = {x}^{2} - {y}^{2} + {x}^{2} + 2xy + {y}^{2} = 2 {x}^{2} + 2xy[/tex]
Степень многочлена: 2+1+1 = 4