What is the value of ?

Key Concepts

Variables and Expressions

In algebra, variables represent unknown values and are often denoted by letters such as x or y. Expressions are combinations of variables, numbers, and operations (like addition or multiplication). Understanding how to manipulate these expressions is crucial for solving equations and finding specific values.

Equations

An equation is a mathematical statement that asserts the equality of two expressions, typically involving variables. Solving an equation involves finding the value of the variable that makes the equation true. This process often requires isolating the variable on one side of the equation.

Order of Operations

The order of operations is a set of rules that dictates the sequence in which mathematical operations should be performed to ensure consistent results. The common acronym PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) helps remember this order, which is essential for accurately evaluating expressions.