Question

$\sqrt{9 + 4 \sqrt{5 } }$

Answer 1

√9=3
√4=2
3plus 2√5 I guess this is it amnt sure

Answer 2

4.23

you can simply put the value of √5 which is nearly equals to 2.23 and after this

√(5+4*2.23)= 4.23

hope now u are able to do.