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Choose the correct form of \(6x^2+15x\) after taking out the common factor.

Answer and explanation

Correct answer: \(3x(2x+5)\)

The direct answer is A: \(3x(2x+5)\). A common factor must divide every term. The terms are \(6x^2\) and \(15x\). Their numerical greatest common factor is 3, and both contain at least one \(x\), so the common factor is \(3x\). Divide each term by \(3x\): \(6x^2\div3x=2x\) and \(15x
div3x=5\). Thus \(6x^2+15x=3x(2x+5)\). Multiplying back confirms the result. Option B omits the common factor \(x\), so it does not reproduce the original expression. Option C is algebraically equal to the original expression but has not meaningfully taken out the greatest common factor. Option D is invalid because 5 does not divide the coefficient 6. Memory cue: take out the greatest numerical common factor and the lowest power of every variable shared by all terms.

Related tags

Common FactorMonomial FactorisationAlgebraic ExpressionsGreatest Common FactorFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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