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By taking the common factor, what is the form of \(12x^2y+18xy^2\)?

Answer and explanation

Correct answer: \(6xy(2x+3y)\)

The direct answer is A: \(6xy(2x+3y)\). Find the greatest common factor of the numerical coefficients 12 and 18, which is 6. Both terms contain at least one \(x\) and one \(y\), so the greatest common monomial factor is \(6xy\). Divide each term by it: \(12x^2y\div6xy=2x\) and \(18xy^2\div6xy=3y\). Hence the factorised form is \(6xy(2x+3y)\). Multiplication verifies it: \(6xy\cdot2x=12x^2y\) and \(6xy\cdot3y=18xy^2\). B and C are algebraically equivalent to the original expression after expansion, but they do not take the greatest common factor in the intended form. D expands to \(12x^2y+12xy^2\), so its second coefficient is wrong. The common factor must divide every term exactly.

Related tags

Common FactorFactorisationMonomialsVariablesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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