There is a typo in the equation.
If it were , then it'll work OK.
I am given the equation of a curve: y=x^3 - 5x - (2/x) where x is not equal to 0.
I am told that the points A and B which are (1,-2) and (-1,2) lie on it.
However, when one substitutes 1 and -1 into the equation one gets: -6 and 6 respectively.
I am pretty sure i am not going mad and this is a misprint (it is supposed to be a past exam question from what i gather.)
Am i right?
Thanks