Oh honey, 84 is just begging to be broken down. In exponential form, you've got 2^2 * 3^1 * 7^1. It's like a math party, and 84 is the guest of honor!
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The prime factorization of 42 does not use exponents: 2 x 3 x 7
The GCF of 35, 63, and 84 is 7. The prime factorization of 35 is 5*7. The prime factorization of 63 is 3*3*7 The prime factorization of 84 is 2*2*3*7 The GCF of 35, 63, and 84 is thus 7.
The largest prime factor is 7.
2 x 2 x 3 x 7 makes it composite.
2 x 2 x 3 x 7 = 84 2 x 2 x 3 x 3 x 7 = 252