Question

помогите с 7-6..........​

Answer 1

$\displaystyle 1)(x-1)^2-(x+1)^2=-2*2x=-4x\\\\ 2)(a+8)^2-(a-4)(a+4)=a^2+16a+64-(a^2-16)=a^2+16a+64-a^2+16=\\ \\ 16a+80$