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What is obtained after taking out the common factor from 2x² + 8x?

Answer and explanation

Correct answer: 2x(x + 4)

The direct answer is B: 2x(x + 4). To take out a common factor, identify what is present in every term. The terms are 2x² and 8x. Both contain 2 and x, so their greatest common factor is 2x. Divide each term by 2x: 2x² ÷ 2x = x and 8x ÷ 2x = 4. Putting the factor outside gives 2x(x + 4). Check by multiplying: 2x·x + 2x·4 = 2x² + 8x. Option A expands to 2x + 16, because x was not removed correctly. Option C does not show division by the common factor and includes an incorrect extra x inside. Option D expands to 8x² + 16x, which is too large. Memory cue: take the greatest common numerical factor and the lowest common power of every common variable.

Related tags

Common FactorMonomial FactorFactorisationAlgebraic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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