Unit 1: Essential Review

Key words

• ExpressionKey word · Unit 1ExpressionA mathematical phrase made from numbers, variables and operations.Exactly: A combination of numbers, variables and operations representing a value when defined.Mix-up alert: An expression is not an equation; it has no equals sign.See this in Key wordsClose meaning
• Equivalent expressionKey word · Unit 1Equivalent expressionA different-looking expression with the same value for every allowed input.Exactly: An expression that agrees with another throughout their stated common domain.Mix-up alert: Matching for just one input does not prove equivalence.See this in Key wordsClose meaning
• ExponentKey word · Unit 1ExponentA number that tells you about a power.Exactly: For a positive integer $n$, $a^n$ is the product of $n$ factors of $a$. Zero, negative and rational exponents extend this definition with restrictions.Mix-up alert: $3^2=3\cdot 3$, not $3\cdot 2$.See this in Key wordsClose meaning