Find a formula for the general term a_n of the sequence {1, -1/2, 1/4,-1/8,...}

Question

anonymous · Answer

well, do you see the pattern?

anonymous · Answer

I know that its an alternating sequence. Since "1" is positive, it must be raised to a poitive number. And the denominator is squared. But I dont know how to put it in a formula.

anonymous · Answer

$$A{n}=(-1/2)^{n-1}$$

anonymous · Answer

Does that make sense?

anonymous · Answer

Yessss, = ((  
Is there a way I can recognize a formula easier??

anonymous · Answer

Well that's why I asked you if you recognized the pattern, you should always look for the pattern first

anonymous · Answer

The more questions you do, the more patterns you will recognize, so my best advice is to practice

anonymous · Answer

I noticed the 1/2 before. But didnt think to include it in the formula. Thank youu!!  Can you look out for more of my sequences?? lol

anonymous · Answer

Sure, I'll be glad to help, but always make your own best attempt first, it's the best way to learn, anything you get stuck on, just post it up, either myself or some other friendly user will be here to help

anonymous · Answer

Thaaaank you!!