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**Lil B****Member**- Registered: 2005-06-11
- Posts: 2

Hi i was wondering if anyone could help me with this nth term quadrtic equation i just cant figure it out??

the sequance is 7,22,43,70,103,142,187,238

once again please help me find the correct equation i would be extremelly grateful.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

3x^2 + 6x -2

Lets do some spot-checks:

7,22,43,70,103,142,187,238

1,2 ,3 ,4 ,5 ,6 ,7 , 8

where x=1, y=3 * x^2 + 6 * x -2 = 3+6-2 = 7

where x=4, y=3 * x^2 + 6 * x -2 = 3*16 + 6*4 -2 = 48 + 14 -2 = 70

where x=8, y=3 * x^2 + 6 * x -2 = 3*64 + 6*8 -2 = 192 + 48 -2 = 238

Looks Good !

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**Zach****Member**- Registered: 2005-03-23
- Posts: 2,075

Look at Mr. Smug here.

Boy let me tell you what:

I bet you didn't know it, but I'm a fiddle player too.

And if you'd care to take a dare, I'll make a bet with you.

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**Lil B****Member**- Registered: 2005-06-11
- Posts: 2

WOW!!!

thanks maths is fun!!

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