Draw the prime factorization table and put both the numbers on it.
Find common prime factors and divide both of them writing the products down.
Do this until the quotients are either 1 or any prime number.
Write down all the factors used and it will be the prime factorization.
Multiply them and you will find the LCM of the numbers.
Here,
18,21
6,7...................(/3)
Prime factorization=6*7*3
LCM=42*3=126
The prime factorization of 21 is 3 x 7.
In actual fact, the prime factorization of 42 is not 21 x 2, as 21 is not a prime number. The complete prime factorization of 42 is 2 x 3 x 7.
No, prime factorization of 42 is not 21 x 2 because 21 is not a prime number and it can be further broken into primes as 3 x 7. So prime factorization of 42 is 2 x 3 x 7.
Yes, 15 and 21 are relatively prime because they have no common positive factors other than 1. The prime factorization of 15 is 3 and 5, while the prime factorization of 21 is 3 and 7. The only common factor is 3, which means they are not relatively prime.
21 x 33
18 = 2*3*3 21 = 3*7
18 = 21 x 32
18 = 21 x 32
The prime factorization for 21 is: 3x73 x 7 = 21
3 x 7
18 = 21 x 32
18 = 21 x 32
3 x 7 = 21, since both factors are prime, that is the prime factorization of 21.
18 = 2 x 3 x 5 x 19 21 = 3 x 7
The prime factorization of 21 is 3 x 7.
The prime factorization for 21 is 3x7.
Do you mean, "What is the prime factorization of 21?"