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If the value of (kx^2-4x-6) at (x=3) is (9), what is (k)?

Answer and explanation

Correct answer: 3

The expression has value 9 when x=3. Substituting gives \(k(3)^2-4(3)-6=9\), or \(9k-12-6=9\). Thus, \(9k-18=9\), so \(9k=27\) and \(k=3\). For example, if k=1, the expression does not evaluate to 9. Exam tip: Substitute the given value of the variable carefully into every term of the expression.

Related tags

Algebraic ExpressionsSubstitutionPolynomialsLinear EquationsParameter EvaluationIntroduction To PolynomialsMathematicsClass 9 Mcq

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