Respuesta :

We perform prime factorization on both numbers.
Prime factors are prime numbers. These numbers can only be divided by 1 and itself.

42 ÷ 2 = 21
21 ÷ 3 = 7

2, 3, and 7 are prime factors: 2 * 3 * 7 = 42

63 ÷ 7 = 9
  9 ÷ 3 = 3 

3 * 3 * 7 = 63  OR 3² * 7 = 63