What are the excluded values of x for (x+1)/(x^2-1) A. x = –1, x = 0, x = 1 B. x = –1, x = 0 C. x = 0, x = 1 D. x = –1, x = 1

Question

What are the excluded values of x for
`(x+1)/(x^2-1)`

A. x = –1, x = 0, x = 1
B. x = –1, x = 0
C. x = 0, x = 1
D. x = –1, x = 1

Answer 1

The answer would be D. x=-1, x=1

Answer 2

Denominator:


`x^2-1=(x+1)(x-1)=\big(x-(-1)\big)(x-1)`

so excluded values are x = -1 and x = 1.

Answer D.