Question

What is the prime factorization of 45 answers:

5 x 9
2 x 3 x 3
2 x 2 x 3 x 3
3 x 3 x 5

Answer 1

45=9*5=5*3*3

Since 5 and three are prime numbers, you cannot go any further, so the prime factorization would be

3 x 3 x 5 (or 5 x 3^2)