Evaluating Algebraic Expressions

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What is an algebraic expression?

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An algebraic expression is a mathematical phrase that can include numbers, variables, and operation symbols. For example, 3x + 5 is an algebraic expression.

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How do you evaluate an algebraic expression?

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To evaluate an algebraic expression, substitute the values of the variables into the expression and perform the operations.

Front

Evaluate the expression for n = 2 and p = 7: np = ?

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14

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5

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Evaluate 21 + 7x when x = 2.

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35

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1024

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Evaluate 4y + 7 if y = 3.

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19

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What is a variable in algebra?

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A variable is a symbol, often a letter, that represents a number in an expression or equation. For example, in the expression 2x + 3, x is a variable.

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What does it mean to substitute in algebra?

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Substituting means replacing a variable in an expression with a specific value.

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What is the difference between an expression and an equation?

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An expression is a combination of numbers, variables, and operations without an equality sign, while an equation states that two expressions are equal.