## Afrodiddle one year ago What is the exact value of the expression the square root 72. - the square root of 8. + the square root of 128.? Simplify if possible.

1. Afrodiddle

I think I know it

2. Afrodiddle

am I right?

3. Afrodiddle

$12\sqrt{2}$

4. welshfella

factor the numbers first - try and get a perfect square in the factors eg sqrt 72 = sqrt 36 * sqrt 2 = 6 sqrt 2

5. welshfella

sqrt 8 = sqrt 4 * sqrt 2 can you simplify sqrt 128?

6. Here_to_Help15

$\sqrt{72}-\sqrt{8}+\sqrt{128}$ this , right ? can you factor, 72 =.... ? 8=...? 128 =...?

7. Afrodiddle

72 is 6 square roof of 2 8 is 2 square root of 2 128 is 8 square root of 2

8. Here_to_Help15

good! now just factor out sqrt 2 from each term :) can u ?

9. Afrodiddle

whaa?

10. welshfella

6 sqrt2 - 2 sqrt2 + 8 sqrt2

11. welshfella

= ?

12. Afrodiddle

Ahhh. So it is 12 square root of 2?

13. welshfella

yes

14. Afrodiddle

I did that earlier, I just got confused on what he/she said. >.<

15. welshfella

yes but you wrote it 3 times???

16. Here_to_Help15

Sorry

17. Afrodiddle

What do you mean?

18. welshfella

you wrote 12 sqrt2 3 times

19. Afrodiddle

Where?

20. welshfella

in your 3rd post

21. Afrodiddle

It only shows up once for me.

22. welshfella

well thats weird - the first 12 sqrt2 shows up in large font and the next 2 in a smaller font - that so strange.....

23. Afrodiddle

I am haunted :O

24. welshfella

lol