# math againWatch

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#1
What is the nth term rule of the quadratic sequence below?
8,14,22,32,44,58,74,...

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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.
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