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If p(x) = x² − 6x + 8, which monic polynomial has the squares of its zeroes as its zeroes?

Answer and explanation

Correct answer: x² − 20x + 64

Let α and β be the zeroes of p(x). Since p(x)=x^2-6x+8 is monic, Vieta’s relations give α+β=6 and αβ=8. The required zeroes are α^2 and β^2. Their sum is α^2+β^2=(α+β)^2-2αβ=6^2-2(8)=36-16=20. Their product is α^2β^2=(αβ)^2=8^2=64. A monic quadratic with zeroes having sum S and product P is x^2-Sx+P. Substituting S=20 and P=64 gives x^2-20x+64, so option A is correct. Option B is merely the original polynomial. Option C uses an incorrect transformed sum and product, while D has product 64 but the wrong sum. The calculation can also be checked from the actual zeroes 2 and 4, whose squares are 4 and 16; their polynomial is (x-4)(x-16)=x^2-20x+64.

Related tags

PolynomialsTransformed-ZeroesVieta-RelationsQuadraticMathematicsPolynomials In One VariableClass 10 Mcq

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