Radical Help!!!

[cvandoren]

sorry but I dont know how to right them!

radical 2x times radical 3x

radical 6x times radical 2x

radical 30x^2 times radical 3x^2

radical 3x time radical 8x^3

radical 40x^2 times 10x

radical 12x^5 times radical 12x^5

2 radical 6 times 5 radical 3

4 radical10 (-3 radical 2)

2 radical 8 times radical 18

-10 radical 3 (-2 radical 21)

- radical 6 times 7 radical 10

3 radical ab times radical 6ab

radical 2ab^2 times radical 14ab^2

- radical 15a^2b times (- radical 5a^2)

radical 8ab^2 times (- radical 10a^3b^4)

2 radical 18a^2b times 6 radical 3b^2

5 radical 2a^3b^8 times 4 radical 12a^2


Im so sorry that there are so many but i have no clue where to start... also my teacher is gone and our sub has no idea how to do these! If you could please help in some way I be be so happy! Thank you all so much!

 

[jsbeckton]

Can't you just ask how to do one and use that to figure out the rest for yourself? I believe that the first one is supposed to be:

\(\displaystyle \sqrt {2x} {\rm } \times {\rm }\sqrt {{\rm 3x}}\)

for this you just need to know the properties of radicals which must be in your book, look around, its there if you are given these problems. Anyways this is the multiple property of radicals:

\(\displaystyle \sqrt a {\rm } \times {\rm }\sqrt {\rm b} = \sqrt {ab}\)

so \(\displaystyle \sqrt {2x} {\rm } \times {\rm }\sqrt {{\rm 3x}}\) = \(\displaystyle \sqrt {2x{\rm } \times {\rm 3x}} {\rm = }\sqrt {{\rm 6x}^{\rm 2} } {\rm = } \pm x\sqrt 6\)

now try the others

 

[Denis]

Too busy to do a search on radicals?

Plus you have a subteacher that does not understand radicals? Geeesh...

http://www.purplemath.com/modules/radicals.htm

 

[jsbeckton]

I bet it took 5 times longer to post all of those problems than it would have been to do a quick search for examples of radicals. Once you know the properties, its really very easy.