Question

For which values of x will the rational expression below be unidentified? (x-1)(x+1)/x+2​

Answer 1

C. -2

Explanation:

Any number divided by 0 is undefined. So, find the value of x that will make the denominator(x + 2) equal to 0:

x + 2 = 0

Subtract 2 from both sides of the equation to find the value of x:

x = -2

The only value of x that could make the denominator 0 is x = -2.

Hope this helps :)

Answer 2

C

Explanation:

Given

`((x-1)(x+1))/(x+2)`

The denominator of the rational function cannot be zero as this would make it undefined.

Equating the denominator to zero and solving gives the value that x cannot be, that is

x + 2 = 0 ⇒ x = - 2 ← excluded value