SOLUTION: Hello, I would really appreciate if someone would go over these questions and see if the answers are correct or incorrect. Thank you so much!!! Multiplying and Dividing Radic

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Hello, I would really appreciate if someone would go over these questions and see if the answers are correct or incorrect. Thank you so much!!! Multiplying and Dividing Radic      Log On


   

Question 550770: Hello, I would really appreciate if someone would go over these questions and see if the answers are correct or incorrect.
Thank you so much!!!
Multiplying and Dividing Radicals,"
4. (-7√3)(-4√(10) = 28√30
6. (-5√6)(2√3) = 6√3
20.( √5+4)( √5-1) =1+ 3√5
38. √(16)/(36) = 1/9
46. 5/√7 = 5√7/7
56. y/√7+√3 = y (√7-√3)/4
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Multiplying and Dividing Radicals,"
4. (-7√3)(-4√(10) = 28√30
That's correct.
----------------
6. (-5√6)(2√3) = 6√3
= -10sqrt%2818%29+=+-30sqrt%282%29
--------------
20.( √5+4)( √5-1) =1+ 3√5
That's correct.
-----------
38. √(16)/(36) = 1/9
If it's sqrt%2816%29%2F36 it's correct.
- - - -
If it's sqrt%2816%2F36%29
= 4/6
= 2/3
---------
46. 5/√7 = 5√7/7
Correct.
---------
56. y/√7+√3 = y (√7-√3)/4
Correct.