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Ayeshaafzal

  • 3 years ago

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

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  1. hartnn
    • 3 years ago
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    just plug in Tn = -252 then you get a quadratic equation in 'n' can you solve quadratic equations ?

  2. manishsatywali
    • 3 years ago
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    |dw:1358754263944:dw|

  3. manishsatywali
    • 3 years ago
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    n can't b negative so take positive sign n = 2+32/2 n=17

  4. Ayeshaafzal
    • 3 years ago
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    thnx smarty pants

  5. hartnn
    • 3 years ago
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    @Ayeshaafzal ,can you work that out by yourself ??

  6. Ayeshaafzal
    • 3 years ago
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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

  7. hartnn
    • 3 years ago
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    ok.

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