What can I use as a Plus or Minus sign?

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John Steele
John Steele 2015-9-22
回答： Joseph Cheng 2015-9-22
In this equation I can't figure out how to make the + into a plus or minus sign to get both answers other than doing it twice with s1 and s2 instead of s.
s=(-800/(2*.1))+(sqrt(((800/(.1*2))^2)-(1/(.1*.000001))));

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Joseph Cheng
Joseph Cheng 2015-9-22
s=(-800/(2*.1))+[1 -1]*(sqrt(((800/(.1*2))^2)-(1/(.1*.000001))))

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