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Help with Arithmetic Sequence & Common Difference Please!?

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  • Help with Arithmetic Sequence & Common Difference Please!?


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Answer #1 | 05/01 2014 11:46
The formula for the nth term is a(n) = a(1) + (n - 1)d so you know 12 = a(1) + 17d -63 = a(1) + 42d Multiply the first by -1 and add to the second to eliminate a(1) -12 = -a(1) - 17d ----------------------------- -75 = 25d so you know d = -3 Then plug that in to either equation to get a(1).
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