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If (f(x)=x^2+3x) and (g(x)=x^2-3x), what is the nature of ((f-g)(x))?

Answer and explanation

Correct answer: Odd function

The direct answer is option A: an odd function. Subtract the functions carefully: \((f-g)(x)=(x^2+3x)-(x^2-3x)=x^2+3x-x^2+3x=6x\). To test parity, replace \(x\) by \(-x\): \(h(-x)=6(-x)=-6x=-h(x)\). Therefore \(h\) is odd. Option A works because \(6x\) changes sign when \(x\) changes sign. Option B is wrong because an even function satisfies \(h(-x)=h(x)\), which does not happen. Option C is wrong because \(6x\) changes with \(x\), so it is not constant. Option D is wrong because the function does satisfy the odd-function rule. A useful cue is that a linear function through the origin, such as \(6x\), is odd.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsDifference-FunctionsParity

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