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If (y=4), what is the value of (y^2-1)?

Answer and explanation

Correct answer: 15

Given y=4, substitute it into y²−1: 4²−1=16−1=15. Therefore, 15 is the correct answer. 16 is only the value of y²; 1 still has to be subtracted. Exam tip: after substitution, evaluate powers before addition or subtraction.

Related tags

Algebraic ExpressionsSubstitutionEvaluating ExpressionsPolynomialsGrade 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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