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actually it is a 4th degree equation

Oh.that's power 2, typo

I need to know how to work that out.....

cant seem to get it, i think it was a trick

really? doing what??

tutor - teaching high school students

hmm i wonder what answer they wanted

Same here...

multiplying by the conjugate give \(\frac{2}{\sqrt{5+\sqrt{21}}}\) think

any examples anywhere?

example?!

oops sqrt(2) on bottom

how did you get that identity?

From experience...

lol great experience
I want to prove that identity lol

ok i see that identity :)

that one is easy to prove

maybe because it is an actual identity, right? :p

Perfect square is perfect :)

Does that make sense?
Apart from the latex fail...

very interesting
i wouldn't have thought of that

I'm going to post the link to satellite73's post then. He doesn't even come to check..

And thank you for all your time!!!!