The opposite (or inverse) of a number can be defined in a number of different ways.
For example, the additive opposite of 4 is -4 but the multiplicative opposite of 4 is 1/4 or 0.25
Since the question concerns the product it would seem more appropriate to use the multiplicative opposite. Then, the product of a number and its opposite will be always 1.
Incidentally, the product of a number and its additive opposite will be the negative square of the number.
In neither case will it be zero.
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Actually the product of a nonzero rational number and another rational number will always be rational.The product of a nonzero rational number and an IRrational number will always be irrational. (You have to include the "nonzero" caveat because zero times an irrational number is zero, which is rational)
A quantity which does not equal zero is said to be nonzero.
Any nonzero number raised to the power of zero is equal to one (1).By definition.
The absolute value of a number is its distance from zero on the number line, so it is always non-negative. When you multiply two nonzero absolute values, you are essentially multiplying two non-negative numbers together. In multiplication, a positive number multiplied by a positive number always results in a positive number, hence the product of two nonzero absolute values is always positive.
Any number raised to the power of zero is always equal to 1