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If \(p(x)=x^3-3x^2+3x-1\), what is the value of \(p(x)\) at \(x=1\)?

Answer and explanation

Correct answer: 0

The polynomial can be recognised as \(p(x)=x^3-3x^2+3x-1=(x-1)^3\). Therefore, at \(x=1\), \(p(1)=(1-1)^3=0\), so option A is correct. Direct substitution also gives \(1-3+3-1=0\). In an exam, using the identity \(a^3-3a^2b+3ab^2-b^3=(a-b)^3\) helps solve this type of question quickly.

Related tags

Polynomial EvaluationAlgebraic IdentitiesPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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