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If the zeroes of a quadratic polynomial are \((2+\sqrt{3})\) and \((2-\sqrt{3})\), which is the monic polynomial?

Answer and explanation

Correct answer: \(x^2-4x+1\)

Let the zeroes be \(\alpha=2+\sqrt{3}\) and \(\beta=2-\sqrt{3}\). Their sum is \(\alpha+\beta=4\), and their product is \(\alpha\beta=2^2-(\sqrt{3})^2=1\). A monic quadratic with zeroes \(\alpha\) and \(\beta\) is \(x^2-(\alpha+\beta)x+\alpha\beta\), so it is \(x^2-4x+1\). Option B has the wrong sign for the sum. Exam tip: for a monic quadratic, the coefficient of \(x\) is the negative of the sum of the zeroes, while the constant term is their product.

Related tags

Polynomials In One VariableQuadratic PolynomialZeroes And CoefficientsMonic PolynomialSurd RootsPolynomialsMathematicsClass 10 Mcq

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