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All calculators are different, type your make and model into google, search and download Manual.. However, (sum of x)squared means you add together all the values of x then multiply the answer by itself. On my calculator, I would add together all the values of x then press the button x2 (2 being superscript).
Hope this helps!
Viewing 2 posts - 1 through 2 (of 2 total)