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I think we will need more details, so, see you then.
I am afraid then that their answer is correct!
Bobbym :- I think I misled you. it should be -6x^2-(sqrt(7))(1-sqrt(7))x^2
So, I am guessing that you need to know why the remainder is 1-sqrt(7)x^2 in a certain polynomial long division?
I am getting
Yes. That's it.
Is that the problem?
Sorry, I'm rushing. I have to take my wife to London in a minute! I've edited the original.
What is that?
Ha! I can't get that to work either!