4sqrt of 7 + 8 sqrt of 63

simplify the radical expression
4sqrt of 7 + 8 sqrt of 63

4sqrt of 7 + 8 sqrt of 63
= 4 sqrt 7 + 8 sqrt 63
= 4 sqrt7 +8 sqrt (9*7)
= 4 sqrt 7 +8 (3sqrt 7)
= 4 sqrt7 + 24sqrt 7
= 28sqrt 7