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If \(f(x)=6x+2\) and \(f(a)=38\), what is the value of \(a\)?

Answer and explanation

Correct answer: 6

Since \(f(a)=38\), substitute \(a\) for \(x\) in the function: \(6a+2=38\). Thus, \(6a=36\) and \(a=6\), so option A is correct. Option B is incorrect because \(f(5)=6\times5+2=32\), not 38. Exam tip: When the function value is given, substitute the unknown input into the function, solve the resulting equation, and verify the answer by substitution.

Related tags

Function EquationLinear FunctionUnknown InputRelations And FunctionsIntroduction To RelationsMathematicsClass 12 Mcq

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