Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Explain in one or two sentences why multiplying the numerator and denominator of
1
a
+
b
\dfrac{1}{\sqrt{a}+\sqrt{b}}
a
+
b
1
by
a
−
b
\sqrt{a}-\sqrt{b}
a
−
b
removes the radicals from the denominator.
Browse the problem library