# Arithmetic Equation Help

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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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4 weeks ago
#2
(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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#3
(Original post by mqb2766)
That would give a first term
U_1 = -43
Not -50.
0
4 weeks ago
#4
(Original post by Hollymae764)
There are a couple of ways to represent it, but you can say the zeroth term is -57.
0
4 weeks ago
#5
(Original post by Hollymae764)
(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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