the question is:

What is the sum of 5 radical 7 and 3 radical 8?

i don't understand how to solve this because i cant pull out a perfect square

3 answers

5√7 + 3√8

stays that way, since we cannot add/subtract radicals with different bases (radicands)
but its a multiple choice and it doesnt have that as one of the choices...
you could simplify the last term to
6√2 but you still couldn't add them

do they have 5√7 + 6√2 ?