(4+а)^2=4^2+(2*4*a)+a^2=16+8a+a^2
(2х-1)^2=(2x)^2-(2*2x*1)+1^2=4x^2-4x+1
(2а+3b)^2=(2a)^2+(2*2a*3b)+(3b)^2=4a^2+12ab+9b^2
(х^3-3)^2=(x^3)^2-(2*x^3*3)+3^2=x^6-6x^3+9
(4+а)^2=4^2+(2*4*a)+a^2=16+8a+a^2
(2х-1)^2=(2x)^2-(2*2x*1)+1^2=4x^2-4x+1
(2а+3b)^2=(2a)^2+(2*2a*3b)+(3b)^2=4a^2+12ab+9b^2
(х^3-3)^2=(x^3)^2-(2*x^3*3)+3^2=x^6-6x^3+9