(x+8)(x-8)-x^2=x^2-64-x^2
(a+1)^2=a^2+2a*1+1^2
(3-y)^2=y^2-6y+9
(m-9)(m+9)=m^2-81
(4x+3)^2=16x^2+24x+9
(x+8)(x-8)-x^2=x^2-64-x^2
(a+1)^2=a^2+2a*1+1^2
(3-y)^2=y^2-6y+9
(m-9)(m+9)=m^2-81
(4x+3)^2=16x^2+24x+9