nth term: Quadratic sequence: -3, -13, -31, - 57, -91

[jebiden]

Do you always divide by 2 for all equations I have no idea where the 2 came from

[sunnie._.sideup]

thank you so much for this! you've explained this much better than my maths teacher

[aneesaranii]

is there any way to remember the 2a, 3a + b, and a + b + c part? i can never rememeber what to do

[jhawk]

why do you divide the second difference by 2 to find a, if I had a cubic what would I divide the third difference by?

[faizahaij]

Thank you this helped me sooo much for my homework

[mstixx]

Are there any worksheet for nth term . I am in year 6