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Which polynomial is obtained by simplifying \(x^3+\frac{x^2-4}{x-2}\) for \(x\neq2\)?

Answer and explanation

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

Using the difference-of-squares identity, \(x^2-4=(x-2)(x+2)\). Since \(x\neq2\), the factor \(x-2\) can be cancelled, giving \(\frac{x^2-4}{x-2}=x+2\). Therefore, the expression is \(x^3+(x+2)=x^3+x+2\), so option A is correct. Option B has an incorrect sign on the constant term. Exam tip: even after cancellation, retain the original restriction \(x\neq2\).

Related tags

PolynomialsAlgebraic ExpressionsFactorisationDifference Of SquaresRational SimplificationDomain RestrictionIntroduction To PolynomialsMathematics

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