How do you simplify 5 over square root of 7?
5 is a prime number (you cannot make 5 by multiplying two integers).
7 is also a prime number.
Therefore you cannot simplify this fraction further.
You can rewrite it though.
You cannot simplify it much, but you can rationalise the denominator by multiplying both numerator and denominator by
#5/sqrt(7) = (5sqrt(7))/(sqrt(7)sqrt(7)) = (5sqrt(7))/7#