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1. can someone tell how to know if a question is about 'quadratics in disguise'.
how do i recognize one?
2. If there is a term in x^4 then at C1 level, it's likely to be one!
3. What board are you?
4. Usually it'd be when the first term is to the power of 4, eg:
and the second term will be to the power of

Though it could work work when the first term has a power that is double to that of the second term, though I havent come across anything other than 4 before .
5. (Original post by cooldudeman)
can someone tell how to know if a question is about 'quadratics in disguise'.
how do i recognize one?
You'll just have to try to recognise it. Generally speaking, if you have:

, such that,

, it'll be some disguised quadratic, where you can make some substitution. Commonly, in C1, you'll find the powers to be 4 or 6, but it's not restricted to these. You may get something like:

and you'll have to notice that it can be rewritten as,

and so we have a disguised quadratic, with surds and such.
6. ok thanks for the replies

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