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What do we get by factorising (y^2-11y+30)?

Answer and explanation

Correct answer: ((y-5)(y-6))

For a monic quadratic \(y^2+by+c\), find two numbers whose sum is \(b\) and whose product is \(c\). Here the middle coefficient is \(-11\) and the constant term is \(30\). The numbers \(-5\) and \(-6\) have sum \(-5-6=-11\) and product \((-5)(-6)=30\). Since both are negative, their product is positive but their sum is negative.

Therefore \(y^2-11y+30=(y-5)(y-6)\). Expanding gives \(y^2-6y-5y+30=y^2-11y+30\), so option A is correct. Option B has a positive middle coefficient. Option C uses 3 and 10, whose sum is 13 rather than 11, while option D does not provide the required pair of factors.

Related tags

Quadratic FactorisationNegative Middle TermFactors

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