Question

For what value of x is the rational expression below undefined x+8/x^2-2x-24

Answer 1

X is undefined when the denominator is equal to zero, therefor we only need to factor X^2-2x-24.

this factors to (x-6)(x+4)

x-6=0 x+4=0
x=6 x= -4

The expression is undefined when x= 6 or -4