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Dividing Radicals and Rationalizing the Denominator  Problem 7
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
In math, we try to leave the denominators of any fraction as rational numbers (as opposed to roots.) If you have a root in the denominator of your fraction, in order to make it rational, you need to multiply both top and bottom of the fraction by that root. This process is called "rationalizing the denominator" because, if done correctly, the bottom of the fraction becomes an integer and the only roots will be in the numerator. You can choose to simplify the root in the denominator either before you begin (which gives you smaller numbers to work with throughout) or after you have multiplied top and bottom you should get the same answer either way.
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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”
Sample Problems (10)
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Dividing Radicals and Rationalizing the Denominator
Problem 1 8,587 viewsSimplify:
5√8 √3x 
Dividing Radicals and Rationalizing the Denominator
Problem 2 6,747 viewsSimplify:
4 √7 + √10 
Dividing Radicals and Rationalizing the Denominator
Problem 3 6,412 viewsSimplify:
3 √12 + √8 
Dividing Radicals and Rationalizing the Denominator
Problem 4 654 views 
Dividing Radicals and Rationalizing the Denominator
Problem 5 630 views 
Dividing Radicals and Rationalizing the Denominator
Problem 6 561 views 
Dividing Radicals and Rationalizing the Denominator
Problem 7 522 views 
Dividing Radicals and Rationalizing the Denominator
Problem 8 569 views 
Dividing Radicals and Rationalizing the Denominator
Problem 9 580 views 
Dividing Radicals and Rationalizing the Denominator
Problem 10 586 views
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