Question

 

√9-4√5

 

Answer 1

= \(\sqrt{3}\sqrt{3}-4\sqrt{5}\)

= \(\sqrt{3^2}-4\sqrt{5}\)

= 3 - \(4\sqrt{5}\)

Answer 2

=\(\sqrt{4-4\sqrt{5+\left(\sqrt{5}\right)^2}}=\sqrt{\left(2-\sqrt{5}\right)^2}=\left|2-\sqrt{5}\right|=-\left(2-\sqrt{5}\right)=\sqrt{5}-2\)

Answer 3

\(\sqrt{9-4\sqrt{5}}=\sqrt{5}-2\)