,

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

The LCM is the smallest number that all of the numbers divide into evenly.

1. List the prime factors of each number.

2. Multiply each factor the greatest number of times it occurs in either number.

Since has no factors besides and .

is a prime number

has factors of and .

Multiply by .

The factor for is itself.

occurs time.

The LCM of is the result of multiplying all factors the greatest number of times they occur in either term.

The Least Common Multiple of some numbers is the smallest number that the numbers are factors of.

Find the LCM 2n-10 , 4n-20