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If \(x=-4\), what is the value of \(\frac{x^3-2x^2+8}{x}\)?

Answer and explanation

Correct answer: 22

On substituting \(x=-4\), \(x^3=(-4)^3=-64\) and \(x^2=(-4)^2=16\). Hence the numerator is \(-64-2(16)+8=-64-32+8=-88\). Therefore, \(\frac{-88}{-4}=22\), so option B is correct. A value such as \(26\) can result from mishandling the negative sign in \(-2x^2\). Exam tip: the square of a negative number is positive, whereas its cube is negative.

Related tags

Algebraic ExpressionsSubstitutionEvaluating ExpressionsPolynomialsInteger OperationsIntroduction To PolynomialsMathematicsClass 9 Mcq

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