# Nth TermWatch

This discussion is closed.
#1
I've not seen this before, when trying to get an nth term formula...

an^2 + bn + c

What do a, b and c represent?
0
13 years ago
#2
constants
0
#3
(Original post by El Stevo)
constants
So say there was a sequence...

100
210
330
460

How would you apply it?

The example I have here says 95n + 5n^2, but I can't see where the constants came from.
0
13 years ago
#4
You need three terms of the sequence to work out the three constants.

a + b + c = 100
4a + 2b + c = 210
9a + 3b + c = 330

3a + b = 110
5a + b = 120

2a = 10
a = 5

b
= 110 - 3a
= 95

c
= 100 - a - b
= 0
0
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