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If \(p(x)=x^3-6x^2+12x-8\), what is the value of \(p(5)\)?

Answer and explanation

Correct answer: 27

Recognising the identity gives \(p(x)=(x-2)^3\), since \((x-2)^3=x^3-6x^2+12x-8\). Therefore, \(p(5)=(5-2)^3=3^3=27\). The value 32 can result from an error while evaluating the cube. In an exam, first check whether a cubic polynomial matches a standard identity such as \((x-a)^3\).

Related tags

Polynomial EvaluationCubic IdentitiesPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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