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What is the complete factorisation of \(x^3+3x^2+2x\)?

Answer and explanation

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

The correct answer is B: \(x(x+1)(x+2)\). First identify the common factor in all three terms: \(x^3+3x^2+2x=x(x^2+3x+2)\). Now factor the quadratic trinomial. We need two numbers whose product is \(2\) and whose sum is \(3\); they are \(1\) and \(2\). Therefore \(x^2+3x+2=(x+1)(x+2)\), giving \(x(x+1)(x+2)\). Option A would produce \(x(x^2+5x+6)=x^3+5x^2+6x\). Option C would produce \(x^3+4x^2+3x\). Option D takes out only part of the common factor and expands to \(x^3+3x^2\), missing \(2x\). ‘Complete’ means continue factoring until no factor can be split further over the intended integers. Memory cue: take out the common factor first, then factor the remaining quadratic by product and sum.

Related tags

Complete FactorisationCommon FactorQuadratic TrinomialCubic PolynomialClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematics

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