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What will be the factorisation of 15p + 20q?

Answer and explanation

Correct answer: 5(3p + 4q)

The correct answer is A: 5(3p + 4q). Factorisation means writing an expression as a product by taking out a common factor. The numerical coefficients 15 and 20 have greatest common factor 5. There is no variable common to both terms, because one term contains p and the other contains q. Divide each term by 5: 15p ÷ 5 = 3p and 20q ÷ 5 = 4q. Therefore, 15p + 20q = 5(3p + 4q). Option A is correct because expanding it gives 15p + 20q. Option B gives 30p + 20q, so its first term is wrong. Option C gives 75p + 20q, so the factor has not been taken out correctly. Option D gives 15p + 60q, so its second term is wrong. A useful check is to multiply the outside factor by every term inside the bracket. Memory cue: divide every term by the common factor, not just one term.

Related tags

FactorisationCommon FactorHcfAlgebraic ExpressionsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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