book Maths Puzzle Numerical Ability

What is the sum of (2n+1)squared using 0<n<infinity?

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I need help with Algebra question concerning "domain" examples
find the domain of the function;

y=1/2x
y=1/x+3

Thanks, Tony find the value of -
(i+3^.5)^100 + (i-3^.5))^100 + 2)^100