dot product

Question

dot product

lovelyharmonics · Answer

Find the first six terms of the sequence.

a1 = -1, an = 2 • an-1

lovelyharmonics · Answer

hi again c:

anonymous · Answer

oh hi. SOrry idk this one :(

anonymous · Answer

this might help http://www.mathsisfun.com/algebra/vectors-dot-product.html

lovelyharmonics · Answer

that link just took a problem and exploded it bro....

anonymous · Answer

This doesn't look like it has anything to do with dot products. You're given the definition for a recursive sequence. The dot you see is just multiplication; each successive term of the sequence is twice the preceding term.

lovelyharmonics · Answer

oh makes sense now so i just multiply those two and get -2?

anonymous · Answer

how you get dot product in here anyways? :)

anonymous · Answer

Right, since $a_1=-1$ and $a_n=2a_{n-1}$, that means $a_2=2a_1=-2$. Keep up with the pattern and you'll get your first six terms.

lovelyharmonics · Answer

idk.... it was a dot..... and woah .-. can i just multiply it by 2 every time?

anonymous · Answer

nope you get a new value each time

anonymous · Answer

Yes, that's what the sequence is. $a_3=2a_2=2(-2)=-4$ and so on.

anonymous · Answer

a1 = -1, an = 2 • an-1

a1=-1   is first 
a2=2*(a1)=   -2      2nd  
            -1
a3=2*(a2)= -4        3rd  
           -2


amd so on 

however there should be a formula