iHateHegartyMath
Badges: 7
Rep:
?
#1
Report Thread starter 1 week ago
#1
What is the nth term rule of the quadratic sequence below?
8,14,22,32,44,58,74,...

help please
0
reply
Sinnoh
Badges: 22
Rep:
?
#2
Report 1 week ago
#2
You start by looking at the difference between terms. That goes 6, 8, 10, 12 etc. Call that the first difference.
Then you look at the difference between those. That's constant at 2. Call that the second difference

Basically as a rule (it'll do for GCSE), when the second difference is constant, it's a quadratic series - i.e. there's an n2 somewhere in the nth term. If it's 2, then it's n2, if it's 4 then it's 2n2, etc.

Once you've got that down, the rest should be easier to work out.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Sheffield Hallam University
    Get into Teaching in South Yorkshire Undergraduate
    Wed, 26 Feb '20
  • The University of Law
    Solicitor Series: Assessing Trainee Skills – LPC, GDL and MA Law - London Moorgate campus Postgraduate
    Wed, 26 Feb '20
  • University of East Anglia
    PGCE Open day Postgraduate
    Sat, 29 Feb '20

People at uni: do initiations (like heavy drinking) put you off joining sports societies?

Yes (427)
67.67%
No (204)
32.33%

Watched Threads

View All