Study Notes
Algebraic expressions are combinations of variables and constants using operations like addition and subtraction. An algebraic equation is a statement where two expressions are equal. Algebraic formulae use letters to represent variable amounts, and algebraic functions involve only algebraic operations.
- Algebraic Expression — a combination of variables and constants using operations. Example: 3x + 2
- Algebraic Equation — a statement where two expressions are equal. Example: 3x + 2 = 11
- Algebraic Formula — a rule using letters to represent variable amounts. Example: A = πr²
- Algebraic Function — a function involving only algebraic operations. Example: f(x) = x² + 3x
- Commutative Rule of Addition — the order of addition does not matter. Example: a + b = b + a
- Commutative Rule of Multiplication — the order of multiplication does not matter. Example: a × b = b × a
- Associative Rule of Addition — the grouping of addition does not matter. Example: a + (b + c) = (a + b) + c
- Associative Rule of Multiplication — the grouping of multiplication does not matter. Example: a × (b × c) = (a × b) × c
- Distributive Rule of Multiplication — multiplication distributes over addition. Example: a × (b + c) = (a × b) + (a × c)
Exam Tips
Key Definitions to Remember
- Algebraic Expression: A combination of variables and constants using operations.
- Algebraic Equation: A statement where two expressions are equal.
- Algebraic Formula: A rule using letters to represent variable amounts.
- Algebraic Function: A function involving only algebraic operations.
Common Confusions
- Mixing up expressions and equations.
- Forgetting that the order does not matter in commutative and associative rules.
Typical Exam Questions
- What is an algebraic expression? An expression made up of variables and constants using operations.
- How do you apply the distributive rule? Multiply each term inside the bracket by the term outside.
- What is the commutative rule of addition? The order of addition does not matter.
What Examiners Usually Test
- Understanding and applying algebraic rules.
- Simplifying expressions using the distributive rule.
- Identifying and using algebraic expressions and equations correctly.