## anonymous 3 years ago Algebra 2 help? Adding and subtracting radical expressions... So lost

1. anonymous

i got a 100% on that

2. anonymous

Wanna help me out?? :)

3. anonymous

What's the question?

4. anonymous

$7\sqrt{13x}-15\sqrt{2x}+2\sqrt{13x}-4\sqrt{2x}$

5. anonymous

like asking what is $7y-15z+2y-4z$ exactly

6. anonymous

Just combine like terms

7. anonymous

How?

8. anonymous

for example $$7\sqrt{13x}+2\sqrt{13x}=9\sqrt{13x}$$

9. anonymous

and $-15\sqrt{2x}-4\sqrt{2x}=-19\sqrt{2x}$

10. anonymous

yes

11. anonymous

put them together and get $9\sqrt{13x}-19\sqrt{2x}$ there is nothing more than can be done

12. anonymous

since $$\sqrt{13x}$$and $$\sqrt{2x}$$ are not like terms, you cannot combine them in one term

13. anonymous

So that is all? Wow, that's much easier than I thought! Thank you so much! ;D

14. anonymous

yw

15. anonymous

like most math, it is easy when you know what to do