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If every term of a polynomial has a common factor, what is the most appropriate first step in factorisation?

Answer and explanation

Correct answer: Take the common factor outside

The correct answer is A: take the common factor outside. Suppose an expression is 6x² + 9x. Both terms contain 3x, so remove that common factor: 6x² + 9x = 3x(2x + 3). This changes a sum into a product and usually makes the remaining factor easier to factorise further. Option B is not a general algebraic operation for factorisation; exponents are combined only under specific multiplication rules. Option C changes the value and is unrelated to taking a factor. Option D changes the equation or expression and is not a factorisation step. The common factor may be a number, a variable, or a whole bracket. Memory cue: before using identities or splitting terms, check the HCF of every term and take it out once.

Related tags

Common FactorFactorisationPolynomialsAlgebraic IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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