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Glossary
Look up any term from this course. Each entry links back to the lesson that taught it.
| Term | Definition | Lesson |
|---|---|---|
| BODMAS | An order for calculations: Brackets, Orders, Division/Multiplication, Addition/Subtraction. | Order of Operations |
| Coefficient | The number multiplying a letter in a term. | Algebraic Expressions |
| Directed number | A number together with a plus or minus sign, showing its direction from zero. | Directed Numbers |
| Discriminant | The value ac, which tells you how many real solutions a quadratic equation has. | The Quadratic Formula |
| Elimination method | Adding or subtracting two equations so that one unknown cancels out. | Simultaneous Equations |
| Equation | A statement that two expressions are equal, true for only certain values of the letter. | Linear Equations |
| Expanding | Multiplying every term inside a bracket by the term outside it. | Expanding Brackets |
| Factorising | Writing an expression as a product by taking out the highest common factor of every term. | Factorising Expressions |
| Index (power)Also Exponent, Power | A small raised number showing how many times a base number is multiplied by itself. | Laws of Indices |
| Inequality | A statement comparing two expressions using <, >, ≤, or ≥, usually with many solutions. | Inequalities |
| Like terms | Terms with exactly the same letters raised to exactly the same powers. | Algebraic Expressions |
| Linear equation | An equation where the unknown appears only to the power of . | Linear Equations |
| Quadratic equation | An equation that can be written as ax² + bx + c = , where a is not zero. | Quadratic Equations |
| Quadratic formula | = (−b ± √(ac)) / () — solves any quadratic equation ax² + bx + c = . | The Quadratic Formula |
| Simplifying | Combining like terms so an expression is as short as possible. | Simplifying Expressions |
| Simultaneous equations | Two or more equations sharing the same unknowns, solved together. | Simultaneous Equations |
| Substitution | Replacing a letter in an expression with a given numerical value, then evaluating the result. | Substitution |
| Substitution method (equations) | Rearranging one equation for a letter, then substituting it into the other equation. | Simultaneous Equations |
| Term | A single number, letter, or product of numbers and letters, inside an expression. | Algebraic Expressions |
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