(a-5)^2=a^2-2*a*5+(5)^2=a^2-10a+25
(a+0,5)^2=a^2+2*a*0,5+(0,5)^2=a^2+a+0,25
(1-b) ^2=1^2-2*1*b+b^2=1-2b+b^2
(0,7m+n) ^2=(0,7m) ^2+2*0,7m*n+n^2=0,49m^2+1,4mn+n^2
(6x-10y) ^2=(6x) ^2-2*6x*10y+(10y) ^2=36x^2-120xy+100y^2
(2x^4+3y^3)^2=(2x^4)^2+2*2x^4*3y^3+(3y^3)^2=4x^8+12x^4y^3+9y^6