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What is obtained by taking out the greatest common factor from 18xy − 24y?

Answer and explanation

Correct answer: 6y(3x − 4)

The direct answer is B: 6y(3x − 4). To find the greatest common factor, compare the numerical and variable parts of both terms. The greatest common divisor of 18 and 24 is 6. Both terms contain y, while only the first contains x, so x cannot be part of the common factor. Thus the greatest common factor is 6y. Divide each term by 6y: 18xy ÷ 6y = 3x and 24y ÷ 6y = 4. Keeping the subtraction sign gives 6y(3x − 4). Option A is mathematically equal to the original expression, but 3y is not the greatest common factor because 6y can still be taken out; therefore it does not answer the question as asked. Option C expands to 18xy − 432y, and option D expands to 432xy − 24y. A good check is to multiply the factor outside the brackets back into every term.

Related tags

Greatest Common FactorTwo-Term FactorisationCommon FactorClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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