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What will be the factorised form of 7x² + 14xy?

Answer and explanation

Correct answer: 7x(x + 2y)

The direct answer is A: 7x(x + 2y). Factorisation begins by finding the greatest common factor of all terms. Both 7x² and 14xy contain 7x: 7x² ÷ 7x = x and 14xy ÷ 7x = 2y. Taking 7x outside gives 7x(x + 2y). Expanding verifies the result: 7x·x + 7x·2y = 7x² + 14xy. Option B incorrectly changes the second term to 14x² because it uses 2x instead of 2y. Option C gives 7x² + 14x, which loses the variable y. Option D expands to 14x² + 14xy, so its first coefficient is twice the required value. Memory cue: divide every term by the common factor and write exactly what remains inside the bracket; never change a variable while taking out a factor.

Related tags

FactorisationCommon FactorAlgebraic ExpressionsMonomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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