Question

1)(x-2)степень 2
2)(3m+9n)степень 2
3)(c+8)(c-8)
4)(2a+5b)(5b-2a)

Answer 1

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