add 2 square root 21 + 3 square root 21

10 square root 21
10 square root 42
square root 52
square root 24 + square root 28

1 answer

2 square root 21 + 3 square root 21 = 5 square root 21

10 square root 21 + 10 square root 42 cannot be simplified further.

The simplified form of square root 52 is 2 square root 13.

The simplified form of square root 24 + square root 28 is 2 square root 6 + 2 square root 7.