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If the zeroes of p(x) = x² + bx + 16 are reciprocals of each other, what can be said about b?

Answer and explanation

Correct answer: It is not possible

For a quadratic polynomial ax² + bx + c with zeroes α and β, Vieta’s relation gives αβ = c/a. In this polynomial, a = 1 and c = 16, so αβ = 16, independently of the value of b. If two nonzero numbers are reciprocals of each other, they have the form t and 1/t, and their product is exactly 1. Since the required product would have to be both 16 and 1, the condition is impossible for every value of b. The coefficient b controls the sum α + β = −b, but it cannot alter the fixed product. Thus option A is correct. Options B, C, and D merely assign particular values to b and do not remove the contradiction in the product of the roots.

Related tags

PolynomialsZeroesReciprocal-RootsVieta-RelationsPolynomials In One VariableMathematicsClass 10 Mcq

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