So the integer part of 30 is 5, and the integer part of 30 is (root number 30-5).

M+m 2-n 2 = 5+5 2-(root number 30-5) 2 = 5+25-30+ 10 (root number 30)-25= 10 (root number 30)-25.

Answer 10 (root number 30)-25