Evaluating Algebraic Expressions Review

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What is the order of operations in mathematics?

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The order of operations is a set of rules that determines the sequence in which calculations are performed. The acronym PEMDAS helps remember the order: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

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1

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16

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Evaluate the expression | -a + 2b - 5c | for a = 2, b = -4, and c = 3.

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25

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Apply the order of operations to solve: 40 - 8 + 4 x 2.

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40

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81

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What does it mean to evaluate an algebraic expression?

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To evaluate an algebraic expression means to substitute the values of the variables into the expression and perform the calculations to find a numerical result.

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What is a variable in algebra?

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A variable is a symbol, often a letter, that represents an unknown value in an expression or equation.

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What is an algebraic expression?

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An algebraic expression is a combination of numbers, variables, and operations (such as addition, subtraction, multiplication, and division) that represents a value.

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What is the difference between an expression and an equation?

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An expression is a mathematical phrase that can contain numbers, variables, and operators, but does not have an equality sign. An equation states that two expressions are equal, indicated by an equality sign.