## Variable

### In mathematics, a variable is a symbol or letter that represents an unknown quantity or a changing value

In mathematics, a variable is a symbol or letter that represents an unknown quantity or a changing value. It is used to create algebraic equations and express mathematical relationships. Variables are used to generalize mathematical ideas and solve problems by allowing us to manipulate these symbols to find solutions.

Variables can take on different values depending on the context of the problem. They can be part of an equation or formula and can be manipulated using mathematical operations such as addition, subtraction, multiplication, and division.

For example, consider the equation: 3x + 5 = 20. In this equation, ‘x’ is the variable. It represents an unknown value that we want to find. By manipulating the equation, we can solve for the variable ‘x’ and determine its value.

Variables are commonly used in various branches of mathematics, such as algebra, calculus, and statistics. They play a fundamental role in formulating mathematical models, solving equations, and analyzing mathematical relationships. They allow us to represent and solve problems in a general and abstract manner, making mathematics a powerful tool for understanding and analyzing the world around us.

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