Question

Помогите пожалуйста!

(x+y)(x-y)=
(c-b)(c+b)=
(x+4)(x-4)=
(8-a)(8+a)=
(y-√3)(y+√3)=
(√7-x)(√7+x)=

Answer 1

${x}^{2} - {y}^{2} \\ {c}^{2} - {b}^{2} \\ {x}^{2} - 16 \\ 64 - {a}^{2} \\ {y}^{2} - 3 \\ 7 - {x}^{2}$