The solution is not as complex as the problem.

[@ugomikechinonso]

Great work.

[@justmathsbymike]

Thank you! Cheers!

[@21stCenturyNigeria]

Good job

[@justmathsbymike]

Thanks

[@danielvieira8374]

Since k is varying, you can omit the +/- sign. Further, k=1 and k=3 produces the same answer, as well as k=0 and k=2. So we have only two results, instead of 8. Great job

[@justmathsbymike]

Thanks. A lot.

[@justmathsbymike]

I'm glad you spotted that! You are absolutely right - the solution simplifies quite a bit!