HELP!! It's a hard one TRUST ME....
Sequence... -1,3,-5,7,.... Looking for the RULE ( as in 1,2,3,4,5,... adding 1 each time)

Question

HELP!! It's a hard one TRUST ME....
Sequence...  -1,3,-5,7,....   Looking for the RULE ( as in 1,2,3,4,5,... adding 1 each time)

btaylor · Answer

$$a_{n}=(2n-1)(-1)^{n}$$

btaylor · Answer

because, if it were just 1,3,5,7... it would be arithmetic. So you get the alternating negative/positive by the exponent.

amistre64 · Answer

this is the second time youve asked the same question, what as wrong with the other posting?

amistre64 · Answer

... other than being long and drawn out that is :)

anonymous · Answer

@amistre64 the answer wasn't right.

maheshmeghwal9 · Answer

add 2 & 2 & 2 & 2 & 2 & 2 & so on but one time minus & one time plus as in this: - -1,3,-5,7,-9,11,-13,15,-17 & so on:)
& if u want nth term formula then @BTaylor has given it already:)

anonymous · Answer

BTaylor, everyone seems to think you're answer works best! thank you. i can see that working much better.

amistre64 · Answer

you are getting the same answers here, since its the same sequence tho

amistre64 · Answer

how is the answer checked?

maheshmeghwal9 · Answer

Question should be "It's easy one" LOL

maheshmeghwal9 · Answer

nothing is hard:)
only try & hard work is a best methodology^_^

anonymous · Answer

I had many people try to look at it, people higher then calc 3 and it was getting everyone. haha. so im only in math 111 and so if they couldn't get it i was sooo confused.

amistre64 · Answer

alternating odds aint that difficult to spot ...

btaylor · Answer

yes, but they are a bit of a challenge to put into a rule.