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As long as the roots are the same we can multiply the radicands together using the following property.

Multiplying Radicals – Given positive real numbers A and B and integer n > 1: Since multiplication is commutative just multiply the coefficients together and multiply the radicands together, if the roots are the same, then simplify.

A. Multiply Take care to be sure that the roots are the same before multiplying. We will assume that all variables are positive.

B. Simplify  When dividing radical expressions, as long as the roots are the same, we can divide the radicands using the following property.

Dividing Radicals – Given positive real numbers A and B and integer n > 1: It is our choice to divide the radicands first or simplify first then divide. Either way we choose to work the following problems the results will be the same.

C. Divide (assume all variables are positive) Rationalizing the Denominator

A simplified radical expression can not have a radical in the denominator. When the denominator has a radical in it we must multiply the entire expression by some form of 1 to eliminate it. The basic steps follow. D. Rationalize the denominator. Tip: When rationalizing the denominator the root drives our choices. Multiply numerator and denominator by what you need to raise all the powers of the denominator to equal the root.

This technique does not work when dividing by a binomial which contains a radical. A new technique is introduced to deal with this situation. If we have a radical expression of the form then its conjugate is and E. Rationalize the denominator. 