a) (3a-2b)(a+b) 3a2+3ab-2ab-2b2 b) (x-15)(x-1) x2-x-15x+15=x2-16x+15 c) (x-y)(2x+3y) 2x2+3xy-2xy-3y2=2x2xy-3y2 d) (2b-5)(3-2b)-(3b+2)= 6b-4b-15+10b-3b-2= 9b-17
a) =3a^2+3ab-2ab-2b^2=3a^2+ab-2b^2 b) =x^2-x-15x+15=x^2-16x+15 c) =2x^2+3xy-2xy-3y^2=2x^2+xy-3y^2 d) =6b-4b^2-15+10b-3b-2=13b-4b^2-17 e) =15a^2b^5-20a^3b^2+12ab^6-16a^2b^3 f) =24a^4-8a^3b-9a^3b+3a^2b^2
a) (3a-2b)(a+b) = = 3a² + 3ab - 2ab - 2b² = = 3a² + ab - 2b² b) (x-15)(x-1) = = x² - x - 15x + 15 = = x² - 16x + 15 c) (x-y)(2x+3y) = = 2x² + 3xy - 2xy - 3y² = = 2x² + xy - 3y² d) (2b-5)(3-2b)-(3b+2) = = 6b - 4b² - 15 + 10b - 3b - 2 = = 13b - 4b² - 17 e) (5ab²+4b³)(3ab³-4a²) = = 15a²b⁵ - 20a³b² + 12ab⁶ - 16a²b³ f) 8a²-3ab)(3a²-ab) = = 24a⁴ - 8a³b - 9a³b + 3a²b²
