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What is the form of 3a² + 12ab after taking the common factor?

Answer and explanation

Correct answer: 3a(a + 4b)

The direct answer is A: 3a(a + 4b). Find the greatest common factor of the terms 3a² and 12ab. Both contain 3, and both contain a, so 3a is common. Divide each term by 3a: 3a² ÷ 3a = a and 12ab ÷ 3a = 4b. Therefore 3a² + 12ab = 3a(a + 4b). Option B is mathematically equal to the original expression, but it does not take out the variable a, so it is not the complete greatest-common-factor form expected here. Option C is also equivalent but takes out only a, not the greatest common factor 3a. Option D expands to 6a² + 12ab, which is different. Common-factor check: multiply the outside factor by every term inside.

Related tags

Common FactorMonomialFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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