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If \(f(x)=x-2\) and \(g(x)=x^2+1\), find the value of \((g\circ f)(4)\).

Answer and explanation

Correct answer: 5

In a composition of functions, evaluate the inner function first and then apply the outer function. Thus, \((g\circ f)(4)=g(f(4))\). We have \(f(4)=4-2=2\), so \(g(2)=2^2+1=5\). Therefore, option A is correct. Option B, 17, is obtained by calculating \(g(4)\) directly without first applying \(f\), which is the common error. Exam tip: in \((g\circ f)(x)\), apply \(f\) first and \(g\) second.

Related tags

Composition Of FunctionsFunction EvaluationRelations And FunctionsAlgebraClass 12Introduction To RelationsMathematicsClass 12 Mcq

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