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That is false. A negative times a negative is always a positive. Since absolute numbers are always positive if you make it negative that is not correct.
Yes, multiplying a Positive value by a Negative value always yields a Negative product.
No, two negatives multiplied together always form a positive number.
No, the absolute error cannot be negative. Absolute error is defined as the absolute value of the difference between the measured value and the true value, which ensures that it is always non-negative. It is calculated as |measured value - true value|, and since absolute values are always positive or zero, the absolute error itself will also never be negative.