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If \(p(x)=x^3-6x^2+12x-8\), what are the zero of \(p(x)\) and its multiplicity?

Answer and explanation

Correct answer: Zero 2, multiplicity 3

We can factor the polynomial as \(x^3-6x^2+12x-8=(x-2)^3\), using the identity \((a-b)^3=a^3-3a^2b+3ab^2-b^3\). Therefore, \(p(x)=0\) only when \(x=2\), and the factor \((x-2)\) occurs three times; hence the zero is 2 with multiplicity 3. Option B reverses the zero and its multiplicity. In an exam, first try to express a cubic as a perfect cube to identify repeated zeros quickly.

Related tags

PolynomialsMultiplicityCubic PolynomialPerfect Cube IdentityZeros Of PolynomialPolynomials In One VariableMathematicsClass 10 Mcq

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