Ayeshaafzal
A series is given by the formula
Tn=3+2nn^2
(b) Find n if the nth term is −252.



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hartnn
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just plug in Tn = 252
then you get a quadratic equation in 'n'
can you solve quadratic equations ?

manishsatywali
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dw:1358754263944:dw

manishsatywali
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n can't b negative so take positive sign
n = 2+32/2
n=17

Ayeshaafzal
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thnx smarty pants

hartnn
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@Ayeshaafzal ,can you work that out by yourself ??

Ayeshaafzal
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yes but i was confuse about using 2n in quadratic i didnt know we didnt have to use n in it

hartnn
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ok.