Find the tenth term of -1,2,-4,... how do i find out what r is? do i have to use a1 r^(n-1)?
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Originally Posted by NeedHelp18 Find the tenth term of -1,2,-4,... how do i find out what r is? do i have to use a1 r^(n-1)? $\displaystyle r = \frac{2}{-1} = \frac{-4}{2} = -2$.
ok so r = -2 im lost as to how do u find r...
Originally Posted by NeedHelp18 ok so r = -2 im lost as to how do u find r... Go back and read my post - I have showed you how. It's the common ratio.
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