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What are the factors of q² + 6q + 5?

Answer and explanation

Correct answer: (q + 1)(q + 5)

The direct answer is C: (q + 1)(q + 5). For q² + bq + c, find two numbers whose sum is b and product is c. The required numbers must have sum 6 and product 5. They are 1 and 5. Therefore q² + 6q + 5 = (q + 1)(q + 5). Expanding gives q² + 5q + q + 5 = q² + 6q + 5, confirming the answer. Option A uses 2 and 3; their product is 6 and their sum is 5, so it gives q² + 5q + 6. Option B gives q² − 6q + 5, with the wrong sign in the middle. Option D gives q² + 11q + 30, so both the middle and constant terms are wrong. The memory cue is to check two conditions, not one: the factor numbers must add to the middle coefficient and multiply to the constant term.

Related tags

Trinomial FactorisationSum And ProductQuadratic ExpressionsClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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