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What is obtained by simplifying (x^2(x^3-4)-x^5+7x^2)?

Answer and explanation

Correct answer: \(3x^2\)

First distribute \(x^2\) to each term inside the bracket: \(x^2(x^3-4)=x^5-4x^2\). The expression becomes \(x^5-4x^2-x^5+7x^2\). The like terms \(x^5-x^5=0\) cancel, and \(-4x^2+7x^2=3x^2\). Hence, the simplified expression is \(3x^2\). \(x^5+3x^2\) would result if the \(-x^5\) term were not combined. Exam tip: after expanding brackets, combine only like terms with the same variable and exponent.

Related tags

PolynomialsAlgebraic SimplificationDistributive PropertyLike TermsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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