1) 2xy(y-2) = 2xy y - 2xy 2 = 2xy^2 - 4xy2) -ab(a+b) = -ab a - ab b = -a^2b - ab^23) -2a^2b^3(5a^4-3b^2) = -2a^2b^3 5a^4 - (-2a^2b^3) 3b^2 = -10a^6b^3 + 6a^2b^5
1) 2xy(y-2) = 2xy y - 2xy 2 = 2xy^2 - 4xy
2) -ab(a+b) = -ab a - ab b = -a^2b - ab^2
3) -2a^2b^3(5a^4-3b^2) = -2a^2b^3 5a^4 - (-2a^2b^3) 3b^2 = -10a^6b^3 + 6a^2b^5