1)(x-2)^2=x^2-4x+4
2)(3m+9n)^2=9m^2+54mn+81n^2
3)(c+8)(c-8)=c^2-64
4)(2a+5b)(5b-2a)=-(4a^2+20ab+25b^2)
1)(x-2)^2=x^2-4x+4
2)(3m+9n)^2=9m^2+54mn+81n^2
3)(c+8)(c-8)=c^2-64
4)(2a+5b)(5b-2a)=-(4a^2+20ab+25b^2)