Multiplying and Dividing Radicals'
5.2 ? Mulitplying and Dividing Radicals(Solutions).notebook
October 19, 2015
5.2 ?
MULTIPLYING
AND DIVIDING
RADICAL
EXPRESSIONS
Multiplying and Dividing Radicals'
Rules
1.
Simplify the radical before multiplication.
2.
The radicals must have the same index.
3.
Multiply/Divide the coefficients, then multiply/divide the
radicands (Underneath the root).
5.2 ? Mulitplying and Dividing Radicals(Solutions).notebook
To Multiply:
where:
m, n, a, b are real numbers
Example 1: Simplify the expression
October 19, 2015
5.2 ? Mulitplying and Dividing Radicals(Solutions).notebook
To Divide:
where:
m, n, a, b are real numbers
October 19, 2015
5.2 ? Mulitplying and Dividing Radicals(Solutions).notebook
October 19, 2015
RATIONALIZING DENOMINATORS
Rationalizing ? The process when there is a radical
in the denominator, both the numerator and
denominator must be multiplied by an expression
that will produce a rational denominator.
(ie. Multiply the top and bottom of a fraction to eliminate
the radical on the bottom)
Example 2: Simplify and Rationalize the following expressions.
5.2 ? Mulitplying and Dividing Radicals(Solutions).notebook
c)
d)
October 19, 2015
2¡Ì5
6¡Ì40
If the denominator is a binomial (2 terms), we must
rationalize using it's CONJUGATE.
Conjugates ? 2 binomial factors whose product
is the difference of 2 squares.
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