Homework Help: Calculus

Posted by -Untamed- on Monday, October 3, 2011 at 9:40pm.

About rationalizing denominator, is it true that you can't always multiply by the same square root denominator to get a perfect square?

Calculus - Steve, Tuesday, October 4, 2011 at 8:56am
yes, because (√n)² = n

so, multiplying the root by itself gets rid of the root.

If the denominator is not just a root, but something like √m + n, then you need to multiply by √m - n, since

(√m + n)(√m - n) = m - n²

also, you sometimes have to use

(√m + √n)(√m - √n) = m - n

Answer this Question

Related Questions

Math help plz ASAP. - Rationalize each denominator. 6 + square root of 2 ...
Algebra - I need to rationalize the denominator of 2/3 square root of five, (...
math - Simplify the radical expression by rationalizing the denominator: 2(...
math - Simplify th radical expression by rationalizing the denominator: 2(square...
College Algebra - I need some help with a handful of questions. I need to see ...
College Algebra - I need some help with a handful of questions. I need to see ...
College Algebra help please - I need some help with a handful of questions. I ...
Algebra 2 - simplify the radical expression by rationalizing the denominator. 4...
Algebra - Rationalize each expression by building perfect nth root factors for ...
Calculus/College Algebra - I'm so lost. We're working on limits for this...

For Further Reading

First Name:
School Subject:
Answer: