Hollymae764
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#1
An arithmetic sequence has first term –50 and common difference 7
so is Un = 7n-50
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mqb2766
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(Original post by Hollymae764)
An arithmetic sequence has first term –50 and common difference 7
so is Un = 7n-50
That would give a first term
U_1 = -43
Not -50.
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Hollymae764
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(Original post by mqb2766)
That would give a first term
U_1 = -43
Not -50.
oh so answer is -57
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mqb2766
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(Original post by Hollymae764)
oh so answer is -57
There are a couple of ways to represent it, but you can say the zeroth term is -57.
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philogrobized
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(Original post by Hollymae764)
oh so answer is -57
(Original post by mqb2766)
There are a couple of ways to represent it, but you can say the zeroth term is -57.
the most common form for an arithmetic sequence (I think) is
Un = a plus d(n-1)
so in this case it would be Un = 7(n-1) - 50
Last edited by philogrobized; 4 weeks ago
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