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Subjects
Class 12MathematicsRelations and FunctionsFunctionsHard
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If (f(x)=2x+3) and ((f\circ f)(x)=19), what is the value of (x)?

Answer and explanation

Correct answer: (2)

Step 1: ((f\circ f)(x)=f(2x+3)=2(2x+3)+3=4x+9). Step 2: (4x+9=19), so (4x=10). Step 3: The calculated value is (x=\frac{5}{2}), so the options should include (\frac{5}{2}).

Related tags

CompositionSelf-CompositionError-CheckFunctionsRelations And FunctionsMathematicsClass 12 Mcq
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