anonymous one year ago Help with adding square roots

1. anonymous

$2\sqrt{k}+\sqrt{k}-3\sqrt{k}$

2. idku

if you had $$\tt 2x+x-3x$$ then what would you get?

3. anonymous

just x right?

4. anonymous

-x

5. idku

2 + 1 - 3 = 0

6. anonymous

yeah then 0

7. idku

2x + x - 3x = 0

8. idku

So then, $$\tt 2\sqrt{k}+\sqrt{k}-3\sqrt{k}=0?$$

9. idku

is that correct?

10. anonymous

looks like it idk answer choices are a.) 0 b.) -sqrt k c.) sqrt 3k

11. idku

ok, so we have agreed upon the fact that: $$\tt 2+1-3=0$$ And same way, $$\tt 2a+a-3a~~\longrightarrow~~2a+1a-3a=0$$ Now, $$\tt 2\sqrt{k}+\sqrt{k}-\sqrt{k}a~~\longrightarrow~~2\sqrt{k}-1\sqrt{k}-3\sqrt{k}=?$$

12. anonymous

0

13. idku

Yes, that is the correct answer.