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Which is the simplest factorised form of 8x + 12?

Answer and explanation

Correct answer: 4(2x + 3)

The correct answer is C: 4(2x + 3). Factorisation means taking a common factor outside the bracket. The terms 8x and 12 have common factors 1, 2, and 4; the greatest common factor is 4. Divide each term by 4: 8x ÷ 4 = 2x and 12 ÷ 4 = 3. Therefore 8x + 12 = 4(2x + 3). Expanding confirms it: 4 × 2x + 4 × 3 = 8x + 12. Option A is mathematically equal to the original expression, but it is not simplest because 2 is not the greatest common factor; the bracket can still be factored. Option B expands to 8x + 96, not the given expression. Option D expands to 96x + 12. Memory cue: for the simplest factorised form, remove the greatest common factor from every term.

Related tags

Greatest Common FactorLinear FactorisationDistributive PropertyAlgebraFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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