1) (2х + 3)² - 4х +6а = 4х² + 12ха + 9 - 4х +6а
2) - 11ух +13а(1 - 8у) + 17ух = -11ух +13а - 104ау +17ух =6ух +13а -104ау
3)26хb + (11c - 2x)*b - 16b = 26 xb +11cb-2xb - 16b = 24xb +11cb - 16b
4)(a - b)² + 3a - 3b= (a -b)² +3(a -b) = (a -b)((a -b +3)