SOLUTION: What is the expression for the nth term for 5,3,-1,-7,-15,-25,-37? I know it goes by -2, -4, -6, -8...but I dont know how to find the expression for an= thanks

Question 757787: What is the expression for the nth term for
5,3,-1,-7,-15,-25,-37?
I know it goes by -2, -4, -6, -8...but I dont know how to find the expression for an=
thanks
Answer by josgarithmetic(39615) (Show Source): You can put this solution on YOUR website!
First term starts at 5, then each new term DECREASES by increasing increments of 2.

, , , , ,...

Just generalize what you find. You may form the first and second term like this:
, and ;
Any term of the sequence, using n for the index of term, is .
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