The complex field is a set of which the real numbers are a subset. Among other things, negative numbers also have square roots in the complex field.
In the complex field, the square root of -2.25 is ±1.5iwhere i represents the imaginary square root of -1. The real value can refer to the "±1.5" which precedes i.
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mean: average
it means when you have a real life problem that is relate to math.
Eliminate the lowest value.
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It is a measure of how close the calculated value is to the true value.