SOLUTION: 12 divided by the square root of 20 now when i worked this out i got 3 radical 20 over 5 but the back of the book got 6 radical 5 over 5. i dont see how they got this... teac

Algebra ->  Square-cubic-other-roots -> SOLUTION: 12 divided by the square root of 20 now when i worked this out i got 3 radical 20 over 5 but the back of the book got 6 radical 5 over 5. i dont see how they got this... teac      Log On


   

Question 40802: 12 divided by the square root of 20
now when i worked this out i got 3 radical 20 over 5 but the back of the book got 6 radical 5 over 5. i dont see how they got this...
teacher: robert rapalje
christina
intermediate algebra- one step at a time
Found 2 solutions by astromathman, tutorcecilia:
Answer by astromathman(21) About Me  (Show Source):
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
You have already completed 90% of the problem (good job!). Now you just need to further simplify the radical by factoring 20.
3(radical 5 X 4)/5
Simplify the terms under the radical by finding the square root of 4:
(radical 4 = 2)
Multiply by 2, simplify and you have the correct answer:
3 X 2 (radical 5)/5
6(radical 5)/5