- #1
DiamondV
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Homework Statement
For which number x does the following series converge:
http://puu.sh/lp50I/3de017ea9f.png
Homework Equations
abs(r) is less than 1 then it is convergent. r is what's inside the brackets to the power of n
The Attempt at a Solution
I did the question by using the stuff in relevant equations above eventually leading to a quadratic which I solved and got two answers x is 1 and x is 3. However the solutions given to us by our instructor says
http://puu.sh/lp5be/208cccba8f.png
Why is my answer not the same
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