Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Rationalise the denominator and simplify:
4
7
+
5
\dfrac{4}{\sqrt{7}+\sqrt{5}}
7
+
5
4
.
Browse the problem library