F(x) is a mathematical notation used to represent a function, which is a relationship between a set of inputs and outputs. In this context, "F" denotes the function, while "x" represents the input variable. The output of the function is determined by applying a specific rule or formula to the input value. Functions can be linear, quadratic, or take on various other forms, depending on how the output is calculated. Functions like F(x) are fundamental in mathematics and are used in various fields, including physics, engineering, and economics. They help model real-world situations, allowing for predictions and analysis. Understanding functions is essential for solving equations and exploring relationships between different quantities.