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    Hi there after spending 5 days at this I am nearly there, can anyone help with the last bit ?

    Simply simplifie this for me................And come out with 10n"

    10+30n-30+10n"-10n-20+20

    lots of lollies and laughter
    gina
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    Are you sure that's right?

    10+30n-30+10n-10n-20+20 = 30n - 20 :/.
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    (Original post by Nylex)
    Are you sure that's right?

    10+30n-30+10n-10n-20+20 = 30n - 20 :/.

    Try from here then.............

    10+30n-30+10(n-1)(n-2)20

    please
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    (Original post by gina94)
    Try from here then.............

    10+30n-30+10(n-1)(n-2)20

    please
    10 + 30n - 30 + 200(n^2 - 3n + 3)

    = 200n^2 - 570n + 580 ???
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    (Original post by Nylex)
    10 + 30n - 30 + 200(n^2 - 3n + 3)

    = 200n^2 - 570n + 580 ???

    a+(n-1)+half(n-1)(n-2)c

    10+(n-1)30+half(n-1)(n-2)20
    10+30n-30+10(n-1)(n-2)20 ????????????

    sorry

    help me please
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    (Original post by gina94)
    10+(n-1)30+half(n-1)(n-2)20
    10+30n-30+10(n-1)(n-2)20
    Where does that 10 come from in the last bit?

    Is your top line meant to be: 10 + (n - 1)30 + 0.5(n - 1)(n - 2)20 ?

    => 10 + 30n - 30 + 10(n^2 - 3n + 3)

    => 10n^2 + 10
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    (Original post by Nylex)
    Where does that 10 come from in the last bit?

    Is your top line meant to be: 10 + (n - 1)30 + 0.5(n - 1)(n - 2)20 ?

    => 10 + 30n - 30 + 10(n^2 - 3n + 3)

    => 10n^2 + 10

    There is a sequence 10, 40, 90, 160, 250
    30 50 70 90
    20 20 20

    The equatation given was:

    a+(n-1)+0.5(n-1)(n-2)c

    it is 15 years since i did maths and i am completely lost sorry
 
 
 
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