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If x − 2 is a factor of the polynomial p(x) = x³ + kx² − 4x − 12, what is the value of k?

Answer and explanation

Correct answer: 3

By the Factor Theorem, if x − 2 is a factor of p(x), then p(2) = 0. Therefore, 2³ + k(2²) − 4(2) − 12 = 0, giving 8 + 4k − 8 − 12 = 0. Thus, 4k − 12 = 0 and k = 3. Option B results from a sign error. Exam tip: whenever x − a is a factor, substitute x = a and set the polynomial equal to zero.

Related tags

Factor TheoremPolynomial FactorsZeros Of PolynomialOne Variable PolynomialPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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