Factorial Equation

[albertowusu]

I really appreciate your teachings. It's reminded me of what I learnt some years back. But please, could you go through the rules of factorial again for is to get a clear understanding again please?.

[okunroboprincewill]

Thank you for this great clarification.

[subratabiswas]

x=2 & x= log(-9) whose base is 2.