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

Mathematics
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just plug in Tn = -252 then you get a quadratic equation in 'n' can you solve quadratic equations ?
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n can't b negative so take positive sign n = 2+32/2 n=17

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Other answers:

thnx smarty pants
@Ayeshaafzal ,can you work that out by yourself ??
yes but i was confuse about using 2n in quadratic i didnt know we didnt have to use n in it
ok.

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