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Multiplying and Distributing Radical Expressions  Concept
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
Multiplying rational expressions is basically two simplifying problems put together. When multiplying rationals, factor both numerators and denominators and identify equivalents of one to cancel. Dividing rational expressions is the same as multiplying with one additional step: we take the reciprocal of the second fraction and change the division to multiplication.
When you're asked to multiply or divide radicals expressions meaning they have square roots, it's a lot like distributing and foiling. Those are the ideas you're going to keep in mind. Remember foil means when you have two binomials, you multiply the first, the outers, the inners, the last, that's what foil stands for and then combine like terms.
Before you start there's a couple of things I want to show you to keep in mind. The first thing is that, if you were to see something like square root of 9 times square root of 9, you could do that problem right? Square root of 9 is 3, square root of 9 is 3, so your answer would be 9. Check it out. That was your radicand all along. Same idea with things that have noninteger square roots. Like square root of 10. Square root of 10 is some nasty decimal, I don't know what it is. But I do know that square root of 10 times square root of 10 equals regular old 10. That's really important. Or to generalise it, square root of x times square root of x equals x.
That's going to become really important when you start multiplying square roots. Again just keep in mind what you already know about distributing and use foil if you have a binomial.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
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Sample Problems (7)
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Multiplying and Distributing Radical Expressions
Problem 1 8,228 viewsMultiply:
(3√6x)(2√6x) 
Multiplying and Distributing Radical Expressions
Problem 2 6,679 viewsSimplify:
√3x(√4x − 5) 
Multiplying and Distributing Radical Expressions
Problem 3 5,804 viewsSimplify:
(4 + √6)(3 − √6) 
Multiplying and Distributing Radical Expressions
Problem 4 5,141 viewsSimplify:
(2√10 + 3√5)(√10 − 3√5) 
Multiplying and Distributing Radical Expressions
Problem 5 638 views 
Multiplying and Distributing Radical Expressions
Problem 6 748 views 
Multiplying and Distributing Radical Expressions
Problem 7 538 views
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Camille · 1 month, 2 weeks ago
OKAY REALLY IT WAS SO GOOD THEN I HAD TO PAY