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If \(f(x)=x^3\) and \(g(x)=x^2\), what are the real solutions of \((f-g)(x)=0\)?

Answer and explanation

Correct answer: \(x\in\{0,1\}\)

\((f-g)(x)=f(x)-g(x)=x^3-x^2=x^2(x-1)\). By the zero-product property, \(x^2=0\) gives \(x=0\), and \(x-1=0\) gives \(x=1\). Hence the real solutions are \(0\) and \(1\). Option B is incomplete because it omits \(x=0\). Exam tip: factor the expression first, then set each factor equal to zero.

Related tags

Relations And FunctionsAlgebra Of Real FunctionsPolynomial EquationsFactorisationZero Product PropertyMathematicsClass 11 Mcq

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