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What is obtained by simplifying \(x^2+\frac{x^2-1}{x+1}\) for \(x\neq-1\)?

Answer and explanation

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

Factorising gives \(x^2-1=(x-1)(x+1)\). Since \(x\neq-1\), \(\frac{(x-1)(x+1)}{x+1}=x-1\). Hence the expression is \(x^2+(x-1)=x^2+x-1\). The close distractor \(x^2+x+1\) has the wrong sign for the constant term. Exam tip: factorise before cancelling and retain values that make the original denominator zero.

Related tags

PolynomialsAlgebraic ExpressionsFactorisationRational ExpressionsDomain RestrictionsIntroduction To PolynomialsMathematicsClass 9 Mcq

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