x^2-2xy+y^2+xy-x^2=y^2-xy
a^2+2ab+b^2-2ab+2b^2=a^2+3b^2
-5(1-4c+4c^2)=-20c^2+20c-5
-4(9m^2+6mn+n^2)=-36m^2-24mn-4n^2
a^2+ab+ba+b^2=(a+b)^2
a^2+2ab+b^2=a^2+2ab+b^2
a^2-2ab+b^2=a^2-ab-ab+b^2
a^2-2ab+b^2=a^2-2ab+b^2
x^2-2xy+y^2+xy-x^2=y^2-xy
a^2+2ab+b^2-2ab+2b^2=a^2+3b^2
-5(1-4c+4c^2)=-20c^2+20c-5
-4(9m^2+6mn+n^2)=-36m^2-24mn-4n^2
a^2+ab+ba+b^2=(a+b)^2
a^2+2ab+b^2=a^2+2ab+b^2
a^2-2ab+b^2=a^2-ab-ab+b^2
a^2-2ab+b^2=a^2-2ab+b^2