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What is the simplest factorised form of (3x^2+12x)?

Answer and explanation

Correct answer: 3x(x+4)

The direct answer is A: \(3x(x+4)\). Look at each term, \(3x^2\) and \(12x\), and find their greatest common factor. Both contain 3 and x, so the greatest common factor is \(3x\). Divide each term by \(3x\): \(3x^2÷3x=x\) and \(12x÷3x=4\). Therefore \(3x^2+12x=3x(x+4)\). Expanding gives \(3x^2+12x\), confirming the result. B is equal to \(3x^2+12x\), but it leaves x common inside the bracket, so it is not the simplest factorised form. C is also an incomplete extraction because 3 is still common inside \(3x+12\). D expands to \(12x^2+36x\), which is different. The useful habit is to take out the greatest common factor, not merely any common factor.

Related tags

Common FactorGreatest Common FactorFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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