Factor trees lead to prime factorizations. Negative numbers don't have prime factorizations. We'll do 98. If you want, you can put -1 in front of it.
98
49,2
7,7,2
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98 49,2 7,7,2
Use a factor tree. 98 49,2 7,7,2
196 98x2=196 49x2=98 7x7=49 2x2&7x7
70 35,2 7,5,2 98 49,2 7,7,2 2 x 5 x 7 x 7 = 490, the LCM
Since 49 is a factor of 98, it is automatically the GCF.