Find the least common denominator of the two rational expressions:

http://static.k12.com/bank_packages/files/media/mathml_57cc2a9bb11ebf0120d353959518d6c1bae6831f_1.gif

A.
The LCD is k + 3.

B.
The LCD is k^2 – 9.

C.
The LCD is 3 – k.

D.
The LCD is k – 3.

Question

Find the least common denominator of the two rational expressions:
 
http://static.k12.com/bank_packages/files/media/mathml_57cc2a9bb11ebf0120d353959518d6c1bae6831f_1.gif 

 
 A.
The LCD is k + 3.
 
 B.
The LCD is k^2 – 9.
 
 C.
The LCD is 3 – k.
 
 D.
The LCD is k – 3.

anonymous · Answer

sorry i got (k+3)(k−3)

anonymous · Answer

but you can say that b and c are not it