Question

3. Simplify (3 + root 5 ) (3- root 5)​

Answer 1

Answer:

$(3 + \sqrt{5} )(3 - \sqrt{5} ) \\ {3}^{2} - { \sqrt{5} }^{2} \\ 9 - 5 = 4$

4 is the answer

Answer 2

Answer:

by the identity:- (a - b)(a + b) = a^2 - b^2

$(3 + \sqrt{5} )(3 - \sqrt{5} ) \\ \\ ( {3}^{2}) - ( \sqrt{ {5}})^{2} \\ \\ 9 - 5 \\ \\ 4$

Hope it helps to you !!