"I came up with the following" means that you thought of it; you invented it. Can we assume you didn't?
It's a rather silly mnemonic. As it reads (2 + 6) / (F x 4), it means that questioning is made better by (2 + 6), but worse by (F x 4), since "over" is followed by a denominator: you divide (2 + 6) by (F x 4). I would have thought that good questioning would have been enhanced by (F x 4) rather than diminished. They probably don't mean it this way, so they shouldn't write it in mathematical notation.
Where did you find this?
Student or Learner