Question

$(\sqrt{a^{2}-b^{2} } +a-b)(\sqrt{a^{2}-b^{2} }-a+b)$

Answer 1

Ответ:

2ab-2b²

Пошаговое объяснение:

√(a²-b²)=x

a-b=y

(x+y)(x-y)=x²-y²=a²-b²-(a-b)²=a²-b²-a²+2ab-b²=2ab-2b²

вуаля (づ｡◕‿‿◕｡)づ

Answer 2

$(\sqrt{a^{2}-b ^{2}} +a-b)(\sqrt{a^{2}-b ^{2}} -a+b)=-(a-b+\sqrt{a^{2}-b ^{2}})(a-b-\sqrt{a^{2}-b ^{2}})=-((a-b)^{2} -(\sqrt{a^{2}-b ^{2}})^{2} )=-(a^{2} -2ab+b^{2} -(a^{2} -b^{2} ))=-(a^{2} -2ab+b^{2} -a^{2} +b^{2} )=-(-2ab+2b^{2} )=2ab-2b^{2}$

Вроде так)))