Which expression is the lcd of these fractions 4/x^2y 20/xy

Question

Answer:

LCD of    4 and 20
   (x^2)y xy

Without any mathematical operations involved, ask yourself how many common variables are in the denominators. x^2 is the same as (x)(x)

so we have 4    and 20
(x)(x)(y)    (x)(y)

So what we have in common is one (x) and one (y).

The LCD is xy