In mathematics, we use the natural numbers (0, 1, 2, 3, ...) to represent positive values. Negative numbers (-1, -2, -3, ...) represent values that are less than zero. Therefore, it is not possible to be negative 1 in math, but -1 is a valid negative number.
In mathematics, there is a concept called "imaginary numbers" which includes the imaginary unit denoted by the symbol "i". The imaginary unit is defined as the square root of -1, which means that i * i = -1. However, it's important to note that "i" represents a non-real number and is not considered a negative number. Negative numbers are defined within the set of real numbers.
