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# Nth term homework problem??? watch

1. What is the nth term of:
12,26,46,72,104,142
this is my cousins homework and shes so confused.
thanks
2. (Original post by Selgomez11)
What is the nth term of:
12,26,46,72,104,142
this is my cousins homework and shes so confused.
thanks
The differences are 14, 20, 26, 32, ... and the second differences are 6, 6, 6, 6, ...

The second difference is constant which makes this a quadratic sequence.

Quadratic sequences have nth term of the form , where a is the second difference divided by 2.

So a = 6/2 = 3 and the nth term is .

Can you find b and c?
3. (Original post by Selgomez11)
What is the nth term of:
12,26,46,72,104,142
this is my cousins homework and shes so confused.
thanks
This isn't a homework service. What does she know anything about quadratic sequences?

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