Original post by DFranklin
It 'bounces' if the root is repeated an *even* number of times.
OK thank you
Original post by Bird1234
OK thank you
Equivalently, note that if you had an even power outside the bracket like (6x-5)^2 then the bracket could only be positive or 0, but when you've got something like (3x-7)^3 the fact that it's cubed means that (unless there's a restriction on the domain) when the thing inside the brackets becomes negative, its cube will be negative also.
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