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If \(p(x)=x^3-4x^2+x+6\), which of the following is a zero of \(p(x)\)?

Answer and explanation

Correct answer: 2

A number \(k\) is a zero of a polynomial if \(p(k)=0\). Here, \(p(2)=2^3-4(2)^2+2+6=8-16+2+6=0\), so 2 is a zero. The other options do not work: \(p(1)=4\), \(p(4)=18\), and \(p(5)=36\). Exam tip: For integer options, substitute them directly into the polynomial and check which gives zero.

Related tags

Zeros Of PolynomialsPolynomial EvaluationCubic PolynomialPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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