Can real numbers be negative?

Yes, real numbers can be negative.

Real numbers include both positive and negative numbers, as well as zero. The set of real numbers encompasses all numbers that can be represented on the number line, including:

Positive numbers (e.g., 1, 2, 3)
Negative numbers (e.g., -1, -2, -3)
Zero (0)
Rational numbers (fractions, such as 1/2 or -3/4)
Irrational numbers (such as the square root of 2 or pi)
Negative real numbers are any numbers less than zero. They are represented to the left of zero on the number line. Examples of negative real numbers include -1, -5.3, and -√2.