Find all the numbers for which the rational expression is not defined.

Question

Find all the numbers for which the rational expression is not defined.

 

x^2-11x+28/x^2-x-30

 

 

Answer 1

Dill, to find the rational numbers in which the expression is not defined is to find what values of x in the denominator to equal to zero.

 

x^2-x-30=0 Use the foil method to determine the roots.

(x-6)(x+5)=0

 

x=6 and x=-5 are the numbers that makes the expression undefined.