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If \(f(x)=x^2\), \(g(x)=x\), and \(h(x)=1\), what is \((f-2g+h)(x)\) equal to?

Answer and explanation

Correct answer: \((x-1)^2\)

For a linear combination of functions, combine their values at the same input: \((f-2g+h)(x)=f(x)-2g(x)+h(x)=x^2-2x+1=(x-1)^2\). Option B has the wrong sign for the middle term, while the other options do not match the expansion. Exam tip: substitute the function values first, then simplify or complete the square.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsLinear-CombinationQuadratic-FunctionsFunction-OperationsAlgebra Of Real FunctionsRelations And FunctionsMathematics

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