The additive inverse of a real number is the number that when added to it equals zero, the identity element for addition. That is, the additive inverse of any real number x is -x.
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There are two main types of inverses. Additive inverses total zero. Any number and its negative are inverses. 3 and -3 are inverses. Multiplicative inverses total 1. 3/4 and 4/3 are inverses. 3/4 x 4/3 = 12/12 = 1 Most often, the word inversely in math means upside down.
Not necessarily. Negatives are called opposites, or additive inverses. Inverses is much more general. For example, the inverse of an exponent is a logarithm.
Binary (you operate on two numbers to arrive at one number). Mutual Inverses.
Sum is the same as add (an addition). For example, 5 + 4 = 9 is the sum of 5 and 4.
The sum in math is the answer of a question that involves addition. For example, the sum of '5 + 2' is '7'.