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

[@sunnie._.sideup]

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

[@MathsWithJay]

Happy to help!

[@deletioninducedin7days919]

Cool!

[@MathsWithJay]

@Dominic Castillo: Thank you!

[@jhawk2402]

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?

[@MathsWithJay]

@JHawk24: Look at the sequence of square numbers: 1, 4, 9, 16, 25...what is the common second difference? For cubics, look at 1, 8, 27, 64, 125,... and what is the third difference?

[@faizahaij7467]

Thank you this helped me sooo much for my homework

[@MathsWithJay]

@FAIZA haji: Glad it helped!

[@seanlepki9121]

Same thanks Jay 😊

[@SangHwaJung]

Why did you divide number 2?

[@MathsWithJay]

Look at the simplest quadratic sequence: 1, 4, 9, 16, 25,... Work out the first differences, then what do you get for all the second differences?

[@m1stixx997]

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

[@MathsWithJay]

Have you seen: ua-cam.com/video/vvayGlslby0/v-deo.html

[@empressdaze5002]

Thank you😊

[@MathsWithJay]

You're welcome 😊