SOLUTION: Find the common difference d for this sequence. 7,3,-1,-5,-9 Find a formula in simplest form, for the nth term a sub n for the sequence So, I know that the common difference

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Question 1141342: Find the common difference d for this sequence. 7,3,-1,-5,-9
Find a formula in simplest form, for the nth term a sub n for the sequence
So, I know that the common difference is -4 but I do not know the formula.
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
Common Difference really, , but sequence is decreasing, not increasing.




If you allow for a common difference to be negative, then:
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
Find the common difference d for this sequence. 7,3,-1,-5,-9
Find a formula in simplest form, for the nth term a sub n for the sequence
So, I know that the common difference is -4 but I do not know the formula.
Formula for specifc term of an AP: 

                                    ------- Substituting  

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