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lol I've tried to do it 3 times but get the same thing.

When I simplify all of them to combine like terms I have-
6sqrt"2" + 4sqrt"7" - 7sqrt"2" - 12sqrt"7"

128=2^7

yep

wait why would 8sqrt"2"= sqrt128 if 128 only has 7 2's?

Oh LOL i see my mistake now -_- careless mistake i didn't even realize lol thx :D

Sounds like you understand this pretty well now. All good now?

so now it's 8sqrt"2" + 4sqrt"7" - 7sqrt"2" - 2sqrt"7" right?

oh yeah so the 2nd-4th term would be 8sqrt"7"+14sqrt"2"+12sqrt"7" right?

okay I see so it'll be A, -6sqrt"2" - 4sqrt"7"

\[a \times \sqrt{x}+b \times \sqrt{x} = (a +b)\times \sqrt{x}\]

Would you mind helping me with another but this time it's rationalizing the denominator?

Okay.

It's not letting me go to my new question.