I'm confused by equations and the finite differences between the results

If I have an equation such as 2n2 ┴ n ┴ 1 then the results of the equation will always be positive. Yet, if I write the results for the equation

1 4 11 22

and then take the finite differences, I discover that the number that precedes 1 in the series is 0, and before that there are negatives, which is impossible when considering the function.

what does this mean?

Re: I'm confused by equations and the finite differences between the results

Quote:

Originally Posted by

**ribbie** If I have an equation such as 2n2 ┴ n ┴ 1

What does this mean? ...

Re: I'm confused by equations and the finite differences between the results

2n squared plus n plus 1 (I copied and pasted from a different program)

Re: I'm confused by equations and the finite differences between the results

I suggest you show us your finite differences and then explain carefully why you think these mean the equation can take negative values.

Re: I'm confused by equations and the finite differences between the results

Quote:

Originally Posted by

**SpringFan25** I suggest you show us your finite differences and then explain carefully why you think these mean the equation can take negative values.

1 4 11 22

3 7 11

4 4

Those are the values for n = 0 to n = 3

working backwards, I get:

-5 0 1 4 11 22

-5 -1 3 7 11

4 4 4 4

Re: I'm confused by equations and the finite differences between the results

hi ribbie

apparently you didn't subtract correctly because 1-0 ain't -1.the number preceding 1 is 2 and not 0.

Re: I'm confused by equations and the finite differences between the results

Quote:

Originally Posted by

**anonimnystefy** hi ribbie

apparently you didn't subtract correctly because 1-0 ain't -1.the number preceding 1 is 2 and not 0.

Indeed, spotted the mistake.

Thanks to all...