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What is the factorisation of (ax+ay+bx+by) by grouping?

Answer and explanation

Correct answer: (a+b)(x+y)

Direct answer: A, (a+b)(x+y). Group the first two terms and the last two terms: ax+ay+bx+by=a(x+y)+b(x+y). Both groups contain the identical binomial (x+y). Taking it common gives (a+b)(x+y). Expanding confirms the result: a(x+y)+b(x+y)=ax+ay+bx+by. Option B expands to ax+ab+xy+by, introducing ab and xy, which are not the given terms. Option C expands to ab+ay+bx+xy, also a different collection of terms. Option D contains only products with ab and does not reproduce the four original terms; it also omits the required dependence on a and b separately. A common mistake is to choose brackets because they look similar without expanding them. The safest method is to group, extract a common binomial, and then multiply back to check every term.

Related tags

Factorisation By GroupingCommon FactorBinomial IdentityClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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