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Banerjeea, I would appreciate if you could explain your solution.

Second is certainly a pretty straightforward case. However, in case 1, how can you get (only) x=1 from a third degree equation? I think you should have 3 roots for an equation of the third order (unless you've repeated roots, like in the second case). Because if there're other roots too, then we cannot say for sure the value of the expression, because of multiple values of x giving multiple values of the expression.

Furthermore, in arriving at x=1 as a solution, did you simply start with substitution? How did you solve the equation of the third degree? _________________

Banerjeea, I would appreciate if you could explain your solution.

Second is certainly a pretty straightforward case. However, in case 1, how can you get (only) x=1 from a third degree equation? I think you should have 3 roots for an equation of the third order (unless you've repeated roots, like in the second case). Because if there're other roots too, then we cannot say for sure the value of the expression, because of multiple values of x giving multiple values of the expression.

Furthermore, in arriving at x=1 as a solution, did you simply start with substitution? How did you solve the equation of the third degree?

I used substitution for the first one, I didn't solve the third degree eqn. Wud love to know if anyone knows how to solve the 1st eqn using algebra.

Banerjeea, I would appreciate if you could explain your solution.

Second is certainly a pretty straightforward case. However, in case 1, how can you get (only) x=1 from a third degree equation? I think you should have 3 roots for an equation of the third order (unless you've repeated roots, like in the second case). Because if there're other roots too, then we cannot say for sure the value of the expression, because of multiple values of x giving multiple values of the expression.

Furthermore, in arriving at x=1 as a solution, did you simply start with substitution? How did you solve the equation of the third degree?

I used substitution for the first one, I didn't solve the third degree eqn. Wud love to know if anyone knows how to solve the 1st eqn using algebra.

Hmm, but isn't it a bit risky, because you don't know if there're two more roots of the equation, and since you do not know which one to use, that doesn't allow you to get to a unique solution for the expression in question? _________________

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