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What are the factors of \(m^2+11m+30\)?

Answer and explanation

Correct answer: \((m+5)(m+6)\)

The direct answer is D: \((m+5)(m+6)\). For a monic quadratic \(m^2+bm+c\), find two numbers whose sum is \(b\) and whose product is \(c\). We need numbers with sum \(11\) and product \(30\); these are 5 and 6. Therefore, \(m^2+11m+30=(m+5)(m+6)\). Expanding confirms it: \(m^2+6m+5m+30=m^2+11m+30\). Option A uses 3 and 8: their product is 24, not 30. Option B uses 4 and 7: their product is 28, not 30. Option C has product 30, but the sum of the constants is \(-11\), producing a negative middle term. Option D has both the required sum and product. Memory cue: for \((m+r)(m+s)\), check both \(r+s\) and \(rs\), not just one.

Related tags

Quadratic FactorisationMiddle TermFactor PairsClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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