Evaluating Expressions - Substitution (7.PFA.2d)

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What is substitution in evaluating expressions?

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Substitution is the process of replacing a variable in an expression with a given value to simplify or evaluate the expression.

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What does it mean to simplify an expression?

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To simplify an expression means to reduce it to its simplest form by performing operations and combining like terms.

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What is a variable in an expression?

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A variable is a symbol, often a letter, that represents an unknown value in mathematical expressions.

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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: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

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What are like terms in an expression?

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Like terms are terms that have the same variable raised to the same power, allowing them to be combined.

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