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Which is the correct factorised form of 15x²y + 20xy²?

Answer and explanation

Correct answer: 5xy(3x + 4y)

The direct answer is A: 5xy(3x + 4y). Factorisation by common factor begins by finding what every term contains. The coefficients 15 and 20 have greatest common factor 5. Both terms contain x and y, but the first has x² and the second has y², so only one x and one y can be taken out safely. The greatest common factor is therefore 5xy. Divide: 15x²y ÷ 5xy = 3x, and 20xy² ÷ 5xy = 4y. Hence 15x²y + 20xy² = 5xy(3x + 4y). Option B is algebraically equivalent to the original expression but does not take out the greatest common factor, because 5x leaves a common y inside both terms. Option C gives 15x²y + 300xy², and option D gives 300x²y + 20xy. Multiplying back is the reliable check for any factorisation.

Related tags

Common FactorTwo-Variable FactorisationMonomial FactorClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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