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What are the correct factors of \(y^2-11y+24\)?

Answer and explanation

Correct answer: \((y-3)(y-8)\)

The direct answer is B: \((y-3)(y-8)\). For a monic quadratic \(y^2+by+c\), find two numbers whose product is \(c\) and whose sum is \(b\). Here the product must be 24 and the sum must be -11. The required numbers are -3 and -8 because \((-3)(-8)=24\) and \(-3+(-8)=-11\). Hence \(y^2-11y+24=(y-3)(y-8)\). A gives \(y^2+11y+24\), so its middle sign is wrong. C gives \(y^2-10y+24\), not the required middle coefficient. D gives \(y^2+14y+24\), with both the sum and sign wrong. The sign pattern is helpful: a positive constant and a negative middle coefficient require two negative numbers. Always check both the product and the sum.

Related tags

Quadratic FactorisationSigned TrinomialAlgebraic ExpressionsMonic QuadraticFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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