leonarddyer1463 leonarddyer1463

19-09-2017
Mathematics

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What is the general term equation, an, for the arithmetic sequence 5, 1, â3, â7, . . . , and what is the 21st term of this sequence?

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ghanami ghanami

19-09-2017

hello :

the nth term ( general term of an arithmetic sequence is :

An =A1+(n-1)d ....a common difference is : d , A1 : the first terme
A1 = 5 and : d = 1 - 5 = - 4 n = 21
A21 = 5 + (21 -1)(-4)
A21 = 5 - 80 = -75

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