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What is the factorised form of (5mn − 10m + 3n − 6)?

Answer and explanation

Correct answer: (5m + 3)(n − 2)

The direct answer is A: (5m + 3)(n − 2). Factor by grouping. Pair the first two terms and the last two terms: 5mn − 10m + 3n − 6 = (5mn − 10m) + (3n − 6). Take 5m common from the first group, giving 5m(n − 2). Take 3 common from the second group, giving 3(n − 2). Now the identical binomial (n − 2) is common, so the expression becomes (n − 2)(5m + 3), which can be written as (5m + 3)(n − 2). Option B expands to 5mn + 10m − 3n − 6, so its middle signs do not match. Option C expands to 5mn − 2m + 15n − 6, with incorrect coefficients. Option D expands to 5mn − 5m + 6n − 6, also different. Always expand your selected factors as a final check. Memory cue: after grouping, the remaining bracket from both groups must be exactly identical, including its signs.

Related tags

GroupingCommon BinomialFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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