To find:
The least common denominator
Solution:
First factorise the denominators of both the fractions and find the common factors along with the uncommon factors.
[tex]x^2-7x=x(x-7)[/tex][tex]x^2-4x-21=(x-7)(x+3)[/tex]
So, the least common denominator is:
[tex]x(x-7)(x+3)[/tex]
Thus, option A is correct.
