Me simplify these radicals without decimals

Hi There

6) √72 = 6√2

7) √98 = 7√2

8) √8= 2√2

9) √12= 2√3

10) √175 = 5√7

11) √216= 6√6

12) √192= 8√√3

13) √343 = 7√7

14) √32= 4√2

15) √28= 2√7

Hint : The first thing you need to find is the largest perfect square witch will divide evenly into the number under your radical sign .

I hope that's help !

just sum

10 + 10 = 20