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On the real numbers, define aRb if and only if |a|=|b|. What is the equivalence class of -3?

Answer and explanation

Correct answer: {-3,3}

The correct answer is C, {-3,3}. The equivalence class of -3 contains every real number x such that xR(-3), which means |x|=|-3|=3. Solving |x|=3 gives two possibilities: x=3 or x=-3. Thus [-3]={-3,3}. A is incomplete because -3 and 3 have the same absolute value. B is also incomplete because -3 itself belongs to its class. D is false because most real numbers do not have absolute value 3; for example, |0|=0 and |5|=5. The relation is an equivalence relation: absolute-value equality is reflexive, symmetric, and transitive because equality itself has these properties. Memory cue: an absolute value forgets the sign, so nonzero values usually occur in opposite-sign pairs in the same class; zero is the only value whose class has one element.

Related tags

Equivalence ClassAbsolute ValueReal NumbersEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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