Maths Coursework - Number Grid.. Help!

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Report 16 years ago
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Right.. the sequence is a quadratic sequence and I'm trying to work out the nth term using this formula:
an2+bn+c
- the 2 should be the little squared 2.

I've tried to work it out and I got this:
When n=1: 10+b+c=10
When n=2: 40+2b+c=40
When n=3: 90+3b+c=90

But that looks like b & c equal 0. So it ends up looking like 90=90, 10=10 etc. which is stating the obvious and is no use at all...

So basically I'm stuck
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