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Which is the correct factorisation of 4a + 8?

Answer and explanation

Correct answer: 4(a + 2)

The correct factorisation is 4(a + 2). Both terms, 4a and 8, have 4 as a common factor. Divide each term by 4: 4a ÷ 4 = a and 8 ÷ 4 = 2. Therefore, 4a + 8 = 4(a + 2). Multiplying back gives 4·a + 4·2 = 4a + 8, which verifies the answer. Option A would expand to 4a + 32, so it is too large in the constant term. Option C would expand to 8a + 32, changing both terms. Option D would give 4a + 8a = 12a, because the a is incorrectly placed outside the constant 8; it is not equivalent to the original expression. A safe checking habit is to multiply the proposed factorisation back. In factorisation, take out the greatest common factor and divide every term by it, not just one term.

Related tags

Common FactorFactorisationDistributive LawLinear ExpressionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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