The prime factorization of 42 using exponents?

'42' being an even number will divide by '2'

Hence

2)42 = 21

3)21 = 7

7 ) 7 = 1

So the prime factors of '42' are 2^(1) X 3^(1) x 7^(1).

#NB the '1' is the exponent. 2,3, & 7 are the primes.