Question

Determine the values for which the rational expression is undefined.Z = __,__

Answer 1

Fort the function:

`(x-1)/(x^2-2x-8)`

The expression is undefined when the denominator is 0, then:

`x^2-2x-8=(x+2)(x-4)`

This expression is equal to 0 when x= -2 or 4.

The expression:

`(x-1)/(x^2-2x-8)`

Is undefined for x= -2 or x=4