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If (f(x)=a+13x) and (f(3)=82), what will (f(9)) be?

Answer and explanation

Correct answer: 160

Given \(f(x)=a+13x\), use \(f(3)=82\): \(a+13(3)=82\), so \(a+39=82\) and \(a=43\). Therefore, \(f(9)=43+13(9)=43+117=160\). Hence, 160 is correct. A nearby value such as 156 can result from an error in the constant term or multiplication. Exam tip: find the unknown constant from the given function value before evaluating the required value.

Related tags

Linear FunctionFunction EvaluationUnknown ConstantPolynomial FunctionsAlgebraic SubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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