Which of the following is a factor of the expression 4x^2-2x-42? Group of answer choices

2x-6

2x-7

x-3

4x-7

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.