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What is the factorisation of ab + ac + ad?

Answer and explanation

Correct answer: a(b + c + d)

The correct answer is A: a(b + c + d). Look at each term: ab, ac and ad. The letter a occurs in every term, so it is the common factor. Divide each term by a: ab ÷ a = b, ac ÷ a = c and ad ÷ a = d. Taking a outside gives ab + ac + ad = a(b + c + d). Option A is verified by distribution: a·b + a·c + a·d = ab + ac + ad. Option B would expand to ab + bc + bd, introducing terms that were not present. Option C would expand to ac + bc + cd, and option D would expand to ad + bd + cd; neither matches the original expression. A common mistake is to choose a letter that appears in only one term. Memory cue: circle the symbols repeated in every term, then place the remaining part inside the bracket.

Related tags

Common FactorFactorisationAlgebraic ExpressionsDistributive PropertyClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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