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Factorise (10pq+15p−4q−6) by grouping.

Answer and explanation

Correct answer: (5p-2)(2q+3)

Direct answer: A, (5p−2)(2q+3). Group the first two and last two terms: (10pq+15p)+(−4q−6). Factor each group: 5p(2q+3)−2(2q+3). Now the common binomial is (2q+3), so take it out: (2q+3)(5p−2), which is the same as (5p−2)(2q+3). Option A expands to 10pq+15p−4q−6, exactly as required. Option B expands to 10pq−15p+4q−6, so several signs are wrong. Option C expands to 10pq+60p−4q−24, not the given expression. Option D expands to 10pq+3p−20q−6, so both the p and q coefficients are wrong. The key step is arranging groups so that the same binomial factor appears in both. Memory cue: if needed, take a negative common factor from the second group.

Related tags

Factorisation By GroupingCommon FactorBinomial GroupingAlgebraFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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