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what is the reciprocal of -2?

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haiiii | Student, College Freshman | (Level 2) eNoter

Posted March 19, 2012 at 9:58 AM via web

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what is the reciprocal of -2?

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rcmath | High School Teacher | (Level 1) Associate Educator

Posted March 19, 2012 at 10:03 AM (Answer #1)

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Reciprocal of a number is 1/number. It does not affect its sign.

Thus the reciprocal of -2 is `-1/2`

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embizze | High School Teacher | (Level 1) Educator Emeritus

Posted March 19, 2012 at 10:05 AM (Answer #2)

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The reciprocal of a number is the number's multiplicative inverse: in other words the number that when you multiply by that number you get 1.

The reciprocal of -2 is `-1/2` since `(-2)(-1/2)=1`

** Note that you do not want to confuse this with a number's opposite, or additive inverse. The additive inverse is a number so that the sum of the numbers is 0. **


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