WAEC WAEC Nigeria General Mathematics
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(Algebraic Expressions)
Evaluating Basic Algebraic Expressions
Evaluating Basic Algebraic Expressions
What Are Algebraic Expressions?
An algebraic expression is a mathematical phrase that can include numbers, variables (like x or y), and operation symbols. For example, 3x + 2 is an algebraic expression.
In WAEC exams, you may be asked to evaluate these expressions by substituting given values for the variables.
How to Evaluate Algebraic Expressions
To evaluate an algebraic expression, follow these steps:
- Substitute: Replace the variables with the given numbers.
- Calculate: Perform the arithmetic operations.
Examples
Example 1: Evaluate 3x + 2y when x = 60 and y = 20
Worked Example
Given: 3x + 2y
Example 2: Evaluate a^2 - 4b when a = 5 and b = 3
Worked Example
Given: a^2 - 4b
Tuity Tip
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Check Your Work: Always double-check your calculations to avoid simple arithmetic errors.
Use Parentheses: When substituting, use parentheses to avoid mistakes with negative numbers or operations.
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