Simplify the following rational expression and express in expanded form.

D m =  

Step-by-step explanation:

factor the expressions in the denominator and the numerator to simplify the expression:

=>

=>

to make a fraction undefined, the numerator should be 0, thus, we substitute the values of m from the options into the denominator to make the denominator equals to 0:

=> = =

in this case, the values of m from option D make the denominator of the fraction equals 0.