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Which polynomial is obtained by simplifying \(x^2+\frac{x^2-1}{x-1}\) for \(x\neq1\)?

Answer and explanation

Correct answer: \(x^2+x+1\)

Factor the numerator: \(x^2-1=(x-1)(x+1)\). Since \(x\neq1\), \(\frac{x^2-1}{x-1}=x+1\). Hence the given expression becomes \(x^2+(x+1)=x^2+x+1\), so option A is correct. Option B incorrectly has a constant term of \(-1\); the simplified expression has \(+1\). Exam tip: Factor the numerator fully before cancelling a common factor, and retain the condition that the denominator must not be zero.

Related tags

PolynomialsAlgebraic ExpressionsFactorisationAlgebraic SimplificationDomain RestrictionIntroduction To PolynomialsMathematicsClass 9 Mcq

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