Rule of Signs

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A negative number multiplied by another negative number gives a positive number.

See also

Negative, Positive

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References

Derbyshire, J. Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics. New York: Penguin, pp. 367-368, 2004.

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Cite this as:

Weisstein, Eric W. "Rule of Signs." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/RuleofSigns.html

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