(2+у)^2

(6-c)^2

(2x+9)^2

(7m-3n)^2

4+4y+y^2

36-12c+c^2

4x^2+36x+81

49m^2-42mn+9n^2

1)(2+у)^2=4+4y+y^2

2)(6-c)^2=36-12c+c^2

3)(2x+9)^2=4x^2+36x+81

4)(7m-3n)^2=49m^2-42mn+9n^2