AT is a tangent line and m Find m

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.

(1/x + 1)^2 + 6 (1/x + 1) +5

The scale factor of what ?