additive inverses
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Not unless at least one of the numbers is zero.
Additive inverses
Any number minus itself equals zero. Any number plus its opposite equals zero. Any number times zero equals zero.
The square root of zero is zero and the square root of one is one. No other real numbers have square roots equal to themselves. In other words, the solution set to x=x2 is {0,1}
Rational numbers are ratios of two integers (the second of which is not zero). They are important if any number needs to be divided into equal parts.