What is law of sign?

The law of signs is a mathematical rule that helps determine the sign of the product or quotient of two numbers based on their individual signs. Specifically, it states that the product or quotient of two positive numbers is positive, the product or quotient of two negative numbers is positive, and the product or quotient of a positive and a negative number is negative. This principle is essential in algebra for simplifying expressions and solving equations involving positive and negative values.