If 39 had any even factor then that 39 would be a multiple of an even factor. Therefore, 39 would be a multiple of 2 and so 39 would be even. It is not and so all factors of 39 are odd.
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Since 13 is a factor of 39, all of its factors are common.
1 and 13 are their only common factors.39: 1, 3, 13, 3965: 1, 5, 13, 65
To find the GCF of 13 and 39, you can list the factors of each number. The factors of 13 are 1, 13. The factors of 39 are 1, 3, 13, 39. 13 is the GCF of 13 and 39. 3 is a prime number has only two factors: 1 and 13. 13 will divide into 39 three times. Since 13 is a prime number that will divide into 39, it has to be the GCF of 13 and 39.
The common factors of 26 and 39 are the numbers that can evenly divide both 26 and 39 without leaving a remainder. The factors of 26 are 1, 2, 13, and 26. The factors of 39 are 1, 3, 13, and 39. The only common factor of 26 and 39 is 1.
4u2 - 6u - 39 does not have rational factors.