1) а) (4+а)^2= 16 +8а-а^2
б) (2х-1)^2=4х^2- 4х+1
в) (2а+3в)^2=4а^2+12ав+9в^2
г)(х^3-3)^2=х^6-6х^3+9
2) а)х^2+6х+9=(х+3)^2=(х+3)(х+3)
б) 25х^2-10х+у^2=(5х-у)^2=(5х-у)(5х+у)
3) (4х+3)^2-24х=16х^2+24х+9-24х=16х^2+9
б) 18с^2-2(3с-1)^2=18с^2-2(9с^2-6с+1)=18с^2-18с^2+12с-2=12с-2