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$(3\sqrt{2}-9\sqrt{3})(5\sqrt{2}+15\sqrt{3})$

2. anonymous

yes that is the problem...do you know how to do it?

Multiply using rules that you need to know (15)(2)-45sqrt6+45sqr6-(135)(3) simplify: 30-405=-375

Do you know the rules for multiplying radicals?

5. anonymous

Somewhat

6. anonymous

This class is killing me so bad....confusing

Take your time and practice

8. anonymous

Thank you so much

$\sqrt{x}\sqrt{y}=\sqrt{xy}$

10. anonymous

That makes sense. but why did you pull the 2 out of the matching radicals

$\sqrt{x}\sqrt{x}=x$

12. anonymous

Awwww...that's where i was making my mistake then...thank you so much for the help!

$\sqrt{2}\sqrt{2}=2$