3*(2x^2-4xy)-(x+2y)*(-3x-y)=
z gory dzieki :)
3*(2x² - 4xy) - (x + 2y)*(-3x - y)= 6x² - 12xy - (-3x² - xy - 6xy - 2y²) =
6x² - 12xy + 3x² + xy + 6xy + 2y² = 9x² - 5xy + 2y²
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3*(2x² - 4xy) - (x + 2y)*(-3x - y)= 6x² - 12xy - (-3x² - xy - 6xy - 2y²) =
6x² - 12xy + 3x² + xy + 6xy + 2y² = 9x² - 5xy + 2y²