There are only a couple of ways to make out of two factors each of which has an ; either and or and .
So start with
and mess about with various integer factors of 84, 84 and 1, 42 and 2, 21 and 3, 14 and 6, or 7 and 12. Nothing seems to work.
So try
with all of those factors of 84. Hmm...2 times 12 is 24 and -7 times 7 is -49 and 25 - 49 is -25. That looks promising. Let me know what you figured out.
John
My calculator said it, I believe it, that settles it
