Question

3. Simplify (3+√7) (3-√7)​

Answer 1

Answer:

2 is the correct

answer of (3+√7)(3-√7)

Answer 2

Answer:

$using \: \: this \: \: identity \\ (x + y)(x - y) = {x}^{2} - {y}^{2} \\ (3 + \sqrt{7} )(3 - \sqrt{7} ) =( {3})^{2} - (\sqrt{7} {)}^{2} \\ = 9 - 7 \\ = 2$

I hope it will help you