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Hmm, I'm getting a little lost here.:frown: ~Kitty

The page is good Robert, but it doesn't explain why. ~Kitty

I know 0! equals 1 by definition, I was asking why. Good to hear from you Daniel. :smile: ~Kitty

That is a good one Halls. I didn't think about that one. Thanks. :smile: So factorials are used in combinetrics, but when I read up one it there wasn't a good explanation of what they are used for. ~Kitty

I think that makes sense. Sidenote: why does 0! equal zero? ~Kitty

I remember e^x from algebra. I didn't know we could use them in trig functions though. So there is no tangible example for factorials other than how we use them in higher math. What about pascal's triangle?

I checked that site actually. It was pretty good. I'll agree with you there. I was just curious if there we any tangible examples. For example; we use bacteria as a real life example of exponantial growth right? Is there anything like that for factorials? :rolleyes:

Hey there everyone, We were discussing factorial sequences in my last pre-calculus class. Factorials are pretty cool. I asked if they had any rel world applications or examples I could put into my notes. She then told us if we could find an example that we'd get extra credit on our quiz, I'm...

No problem! Anytime. :smile:

I see where I went wrong. Sorry Daniel! :redface: I thought the x^2 +5 +6 was all in the numerator not x^2 +5 + (6/x^2). Thats why we were coming up with different answers. Your answer is correct. If you're not sure then try to FOIL it back into the quadratic it was before you factored it...

It wouldn't be because if you multiply the left side of the equation with x^2 over one, the x^2's would divide out and you would be left with x^2 +11.

You'll get 11 when you simplify the 5+6 part of your equation. Does that help? :smile:

After you set the (x^2 +5 +6)/(x^2) equal to zero, mulitply both sides of the equation by x^2. That will eliminate your x^2 from the bottom of the equation. You should end up with x^2 + 11=0 Then just complete the square and factor it.

Ok, you've got x^2 as your demonminator