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If \(f(x)=5x^2+2\) and \(g(x)=2x^2-7\), what is \((f-g)(x)\)?

Answer and explanation

Correct answer: \(3x^2+9\)

For the difference of two functions, \((f-g)(x)=f(x)-g(x)\). Therefore, \((f-g)(x)=(5x^2+2)-(2x^2-7)=5x^2+2-2x^2+7=3x^2+9\). Option A has the wrong constant-term sign because \(-(-7)=+7\). Exam tip: when a minus sign precedes parentheses, change the sign of every term inside them.

Related tags

AlgebraReal FunctionsPolynomial SubtractionSign RulesAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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