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If the zeroes of the polynomial \(x^2-10x+q\) are \(2r\) and \(3r\), what is the value of \(q\)?

Answer and explanation

Correct answer: 24

By Vieta’s formula, the sum of the zeroes is \(2r+3r=5r\). Thus, \(5r=10\), giving \(r=2\). Their product is \((2r)(3r)=6r^2=6\times 2^2=24\). For the monic quadratic \(x^2-10x+q\), the product of the zeroes equals the constant term \(q\), so \(q=24\). Exam tip: for \(x^2+bx+c\), the product of the zeroes is always \(c\).

Related tags

PolynomialsVietas-FormulaZeroes-Of-PolynomialQuadratic-EquationsConstant-TermPolynomials In One VariableMathematicsClass 10 Mcq

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