sqrt(20*9) = sqrt(2*2*5*9) =2*sqrt(45)
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That IS the simplest radical form.
2 square root of 14
The square root of 28 or in this case the radical form of 28 will be 2 times radical 7. Since 28 is 4 times 7 and the square root of 4 is two.
3 square root 10
7 times the square root of 6