Save guides, add subjects and pick up where you left off with your BBC account. In algebra, letters are used to stand for values that can change (variables) or for values that aren’t known ...

An expression is a set of terms combined using the operations +, – , x or \( \div\), for example \(4x − 3\) or \(5x^2 – 3xy + 17\). An equation states that two expressions are equal in value ...

Since the letters are representing unknown numbers, we can perform mathematical operations on these letters too which leads to the study of Algebraic Expressions and Identities. Examples of ...