i need help to find the sum of 1 to infinity of 4 (-3)to the power of x
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Originally Posted by helpless13 i need help to find the sum of 1 to infinity of 4 (-3)to the power of x No, this is not clear. It seems to be asking for: $\displaystyle \sum_{r=1}^{\infty} 4 \times (-3)^r$ which is not convergent. RonL
it isn't clear but I have a formula that says if k<1 , k being the common ratio than the sum is A1 1-K which is -3 and I don't know if that is right
Originally Posted by helpless13 it isn't clear but I have a formula that says if k<1 , k being the common ratio than the sum is A1 1-K which is -3 and I don't know if that is right It's |k| (absolute value) that has to be <1. Here, |-3|=3 > 1.
so does that mean then that a solution does not exist
Originally Posted by helpless13 so does that mean then that a solution does not exist Is that not what was said? RonL
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