Let $f ( x ) = \frac { x + 1 } { x ^ { 2 } - 1 }$ Which of the following is true?

A)ƒ is defined at 1.
B)ƒ is defined at -1.
C)ƒ has a removable discontinuity at -1.
D)ƒ has a removable discontinuity at 1.
E)ƒ is continuous at -1.

Question

Let $f ( x ) = \frac { x + 1 } { x ^ { 2 } - 1 }$ Which of the following is true?

A)ƒ is defined at 1.
B)ƒ is defined at -1.
C)ƒ has a removable discontinuity at -1.
D)ƒ has a removable discontinuity at 1.
E)ƒ is continuous at -1.

Quizplus · Accepted Answer

The Answer of Let $f ( x ) = \frac { x + 1 } { x ^ { 2 } - 1 }$ Which of the following is true?

A)ƒ is defined at 1.
B)ƒ is defined at -1.
C)ƒ has a removable discontinuity at -1.
D)ƒ has a removable discontinuity at 1.
E)ƒ is continuous at -1.

Let f(x)=x+1x2−1f ( x ) = \frac { x + 1 } { x ^ { 2 } - 1 }f(x)=x2−1x+1​