![Trending Articles on Technical and Non Technical topics](/images/trending_categories.jpeg)
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Rationalise the denominator and simplify:$ \frac{5+2 \sqrt{3}}{7+4 \sqrt{3}} $
Given:
\( \frac{5+2 \sqrt{3}}{7+4 \sqrt{3}} \)
To do:
We have to rationalise the denominator and simplify the given expression.
Solution:
We know that,
Rationalising factor of a fraction with denominator ${\sqrt{a}}$ is ${\sqrt{a}}$.
Rationalising factor of a fraction with denominator ${\sqrt{a}-\sqrt{b}}$ is ${\sqrt{a}+\sqrt{b}}$.
Rationalising factor of a fraction with denominator ${\sqrt{a}+\sqrt{b}}$ is ${\sqrt{a}-\sqrt{b}}$.
Therefore,
$\frac{5+2 \sqrt{3}}{7+4 \sqrt{3}}=\frac{(5+2 \sqrt{3})(7-4 \sqrt{3})}{(7+4 \sqrt{3})(7-4 \sqrt{3})}$
$=\frac{35-20 \sqrt{3}+14 \sqrt{3}-8 \sqrt{3} \times \sqrt{3}}{(7)^{2}-(4 \sqrt{3})^{2}}$
$=\frac{35-6 \sqrt{3}-24}{49-48}$
$=\frac{11-6 \sqrt{3}}{1}$
$=11-6 \sqrt{3}$
Hence, $\frac{5+2 \sqrt{3}}{7+4 \sqrt{3}}=11-6 \sqrt{3}$.