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If f(x)=2x²+1, g(x)=x²−3, and h(x)=x²+4, what is the value of (f−g+h)(x)?

Answer and explanation

Correct answer: 2x²+8

Function addition and subtraction are performed pointwise: (f−g+h)(x)=(2x²+1)−(x²−3)+(x²+4). Subtracting g(x) changes the signs of both of its terms, giving 2x²+1−x²+3+x²+4=2x²+8. Option B results from combining the terms incorrectly. Exam tip: when subtracting a function, place it in parentheses and reverse the sign of every term inside.

Related tags

Relations And FunctionsAlgebra Of Real FunctionsFunction OperationsPointwise OperationsMathematicsClass 11 Mcq

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