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Which is the factorisation of (a²+5a)?

Answer and explanation

Correct answer: a(a+5)

The direct answer is A: a(a+5). Look for the greatest common factor of the two terms a² and 5a. Both contain a, so take a outside. Dividing each term by a leaves a from a² and 5 from 5a; hence a²+5a=a(a+5). Checking by distribution, a(a+5)=a·a+a·5=a²+5a, exactly the original expression. Option B expands to 5a+25 and does not contain a². Option C expands to a³+5a², which has powers that are too large. Option D expands to a²+10a+25, adding terms that are not present. The key idea is that factorisation reverses the distributive law: instead of multiplying a through a bracket, we identify what was common and place it outside. Do not confuse a common factor with a term added inside a square.

Related tags

FactorisationCommon FactorAlgebraic ExpressionsPolynomialsGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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