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If the value of (kx^2-5x+3) at (x=2) is (9), what is (k)?

Answer and explanation

Correct answer: 4

At x=2, the expression is equal to 9. So, k(2)^2-5(2)+3=9, or 4k-10+3=9. Hence, 4k-7=9, giving 4k=16 and k=4. If k=3, the expression evaluates to 5, not 9. Exam tip: In value-based questions, substitute the given variable value carefully, especially in terms with exponents.

Related tags

Algebraic ExpressionsPolynomialsSubstitutionLinear EquationParameter ValueIntroduction To PolynomialsMathematicsClass 9 Mcq

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