Question

( a + √b ) ( a - √b )

Answer 1

Ответ:

= а²-b

.................

Answer 2

$\bigg(a+\sqrt{b} \bigg)\cdot\bigg(a-\sqrt{b} \bigg)=a^2-\bigg(\sqrt{b} \bigg)^2=a^2-b.\\==================================\\(a-b)(a+b)=a^2-b^2.$