GWD29-3

meckychen

Q3:

If n is an integer and xⁿ – x^-n
= 0, what is the value of x ?
(1)     x is an integer.

(2)     n ≠ 0

Answer is E

I think it should be B

since,  n ≠ 0 , so X must be 1

n ≠ 0 , so X must be 1

ryanxie

X=-1, 0, 1 皆可

meckychen

Thank you.