Add 3 21−−√ + 7 21−−√

Question

.(1 point)
Responses

1042−−√
10 Start Root 42 End Root

52−−√
Start Root 52 End Root

24 −−−√ + 28−−√
Start Root 24 End Root plus Start Root 28 End Root

1021−−√

Answer 1

To add the expressions \(3 \sqrt{21} + 7 \sqrt{21}\), we can combine the like terms:

\[ 3 \sqrt{21} + 7 \sqrt{21} = (3 + 7) \sqrt{21} = 10 \sqrt{21} \]

So, the answer is:

10 \(\sqrt{21}\).