## anonymous 4 years ago what would this be (sq rt 0f 21) * (sq rt 0f 3)

1. anonymous

Do like the last problem and multiply the two numbers under the root together and then find any perfect squares.

2. anonymous

how there are no perfect roots there is 7 and 3 put neight of those are perfect squaer

3. anonymous

There is 7*3=21 and 3 so your factors are 7,3,3.... because the problem is $\sqrt{21*3}$

4. anonymous

both problems have the same root so you can multiply the numbers under the root together.

5. anonymous

im still not getting this

6. anonymous

What do you get if you multiply 21*3? Then what are the factors of that? Then take out any factor pairs and what is left is what stays under the square root.

7. anonymous

63

8. anonymous

1and63 3and 21 9and 7 so i would use this one

9. anonymous

Right, because 9 is a perfect square and 7 doesn't have any perfect square factors.

10. anonymous

then what do i do with the other half of the problem

11. anonymous

umm what other half.... the problem was $\sqrt{21}*\sqrt{3}$ correct?

12. anonymous