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What are the factors of a² + 5a + 6?

Answer and explanation

Correct answer: (a + 2)(a + 3)

The correct answer is A: (a + 2)(a + 3). To factor a² + 5a + 6, find two numbers whose product is the constant term 6 and whose sum is the coefficient of a, 5. The numbers 2 and 3 satisfy both conditions: 2 × 3 = 6 and 2 + 3 = 5. Thus a² + 5a + 6 = (a + 2)(a + 3). Verify by multiplying: a(a + 3) + 2(a + 3) = a² + 3a + 2a + 6 = a² + 5a + 6. Option B gives a middle coefficient of 7 because 1 + 6 = 7. Option C gives a negative middle coefficient, −5a, and option D gives a much larger product and middle coefficient. Memory cue: for a² + ba + c, look for two numbers that multiply to c and add to b.

Related tags

Trinomial FactorisationQuadratic ExpressionsAlgebraic IdentitiesClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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