Maths- Finding the nth term of a quadratic sequence

how to find the nth term for quadratic sequences

Category:

Education

Tags:

• maths
• quadratic
• sequence
• difference
• squared
• power
• nt
• term
• educational
• diy
• lego
• opening
• technology

[rsgenftw]

what would the answer be to to 1 5 13 25 41

[homeworkhints]

@rsgenftw the answer would be 2n²-2n+1

[koolgalesther]

Then what would the equation be if the series was

1, 3, 6, 10, 15, 21? 

[homeworkhints]

@koolgalesther that sequence is the sequence of triangular numbers.

the equation would be: 1/2n (n+1)

[animation508]

future refference: n^2 for N squared :)

[homeworkhints]

@animation508 thanks, i'll use that in future vids

[AbdullahOmarAnO]

It's 2n square, sorry for pressing the enter button accidentally. Anyways, hope I helped. CHEERS!!

[AbdullahOmarAnO]

Eltener123 it's pretty simple, you just need to find the first difference which is, 6,10,14,18. Then, according to the video above, it's not the same, so you take the second difference. What you'll see is, there are all 4, which means that (square should be added to n). Check: one square gives 1, so times it by 2. Check again: 2square gives 4, times it by 2 and you get your answer. So it's 2 n

[LucyCaja]

This was really helpful, we were trying harder than we needed to.

[fallengavinl]

its complicate when they give u hard exercise..--"

[Eltener123]

I tried your technique but it didnt work for this sequence: 2,8,18,32,50. could you please answer it and tell me the way you found the answer

[RibbonsBowsFashion]

I GET IT :D THANKS SO MUCH! I HAVE AN EXAM TOMORROW ON THIS, I FINALLY GET IT :D

[cowletable]

thanks!!

[mustykingvids]

Thanks awsome explanation keep up the good work