Answer
$k(k^2 - 2)$
Work Step by Step
To find the LCD, or the Least Common Multiple,we must write out each denominator as products of prime factors.
$k = k$
$k^2 - 2 = (k^2 - 2)$
Since there are no common factors between the denominators, the LCD, or LCM, then is $k(k^2 - 2)$