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Which polynomial is obtained by simplifying (x^3(x-2)-x^4+6x)?

Answer and explanation

Correct answer: \(-2x^3+6x\)

First multiply \(x^3\) by \((x-2)\): \(x^3(x-2)=x^4-2x^3\). Thus, the expression becomes \(x^4-2x^3-x^4+6x\). Since \(x^4-x^4=0\), the remaining polynomial is \(-2x^3+6x\). Option A incorrectly leaves the \(-x^4\) term uncancelled. Exam tip: after expanding brackets, combine only like terms with the same power of the variable.

Related tags

PolynomialsAlgebraic SimplificationLike TermsDistributive PropertyClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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