4
comments
Never seen this before. It’s incredible!
I wish I'd spent more time as a kid doing mental math.
I'm terrible at it, but it is a useful skill despite having a phone in my pocket almost all the time.
I would never have guessed that result! What a weird coincidence.
I'm sure there are lots of little coincidences like this.
Taking x=10, the top of the fraction simplifies to:
5x2 + 20x +30
The rest of the solution is left as an exercise for the reader.