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## Main Question or Discussion Point

How would I write the result of this in summation notation after multiplying it out?

([tex]\sum[/tex][tex]^{n}_{i=1}[/tex] x[tex]_{i}[/tex])[tex]^{2}[/tex]

([tex]\sum[/tex][tex]^{n}_{i=1}[/tex] x[tex]_{i}[/tex])[tex]^{2}[/tex]