Of course as epi points out, this kind of formal translation is often abbreviated to y = x plus or minus 1. Again, this conforms to the mathematical definition. Y = x (plus/minus sign) 1 means (x = x + 1) V (y = x - 1). Nevertheless, it is very common to hear "x is equal to plus or minus 3." But the "or" word is never dropped because that corresponds to part of the mathematical definition. Second, it distinguishes between the use of + and - as symbols signifying sign and the use of + and - as symbols signifying the operations of addition and subtraction. First, it closely matches the mathematical definition. schools, it is often taught that the preferred translation into English is "x is equal to positive three or negative three." The reason for that is two fold. X = (plus/minus sign) 3 means mathematically (x = +3) V (x = -3), where V stands for the non-exclusive or. The symbol itself is called typically called a "plus minus sign," but no one will be confused or upset if you say "plus or minus sign." What is 25 5 or just +5 Well, the answer is the latter, that is, just the positive 5. Before you think I’m an idiot, let me clear somethings first. What does the "plus/minus" sign mean when used mathematically? No actually, you NEVER use a plus or minus sign while taking a square root. Some may choose, at certain times, to follow the rule for saying "positive or negative". In practice, Americans and Canadians working in mathematics, science, and engineering often say "plus or minus", for convenience, the same as British, instead of "positive or negative". Schools in those countries teach this rule to children. In this case, the pronunciation is "positive or negative".Ĭanadians also follow the rule, as may those in other places that are affected more by American standards than by British. If the symbol appears before the first term in an expression, then the meaning is that the term is positive or negative.If the symbol appears before a confidence interval in the numeral part of a quantity, then too the pronunciation is "plus or minus".In this case, the pronunciation is the same as in British English, "plus or minus". Then the meaning is the plus operation (addition) or minus operation (subtraction). If the sign appears between two terms in an expression,.In American English, the way to pronounce a plus-minus sign depends on where the sign appears in a mathematical expression or numerical quantity. American EnglishĪmerican English has a rule that British English does not have. Then, you might say either, as long as you remain in the same place. Generally, you should say "plus or minus", unless you discover that others in some place say "plus minus". In other places, those who work with you may find it strange to hear this pronunciation. In some places, you may find that others say simply "plus minus". Generally, you should not say "plus minus". Generally, in English, you may pronounce the plus-minus sign ( ±)
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