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.

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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.

Mathematics
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I think I know it
am I right?
\[12\sqrt{2}\]

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Other answers:

factor the numbers first - try and get a perfect square in the factors eg sqrt 72 = sqrt 36 * sqrt 2 = 6 sqrt 2
sqrt 8 = sqrt 4 * sqrt 2 can you simplify sqrt 128?
\[\sqrt{72}-\sqrt{8}+\sqrt{128}\] this , right ? can you factor, 72 =.... ? 8=...? 128 =...?
72 is 6 square roof of 2 8 is 2 square root of 2 128 is 8 square root of 2
good! now just factor out sqrt 2 from each term :) can u ?
whaa?
6 sqrt2 - 2 sqrt2 + 8 sqrt2
= ?
Ahhh. So it is 12 square root of 2?
yes
I did that earlier, I just got confused on what he/she said. >.<
yes but you wrote it 3 times???
Sorry
What do you mean?
you wrote 12 sqrt2 3 times
Where?
in your 3rd post
It only shows up once for me.
well thats weird - the first 12 sqrt2 shows up in large font and the next 2 in a smaller font - that so strange.....
I am haunted :O
lol

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