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If p(x)=5x^2+2x-8, what is the product of its zeroes?

Answer and explanation

Correct answer: -8/5

For a quadratic polynomial ax^2+bx+c with zeroes alpha and beta, Vieta's relation states that their product is alpha beta=c/a. Here the leading coefficient is a=5 and the constant term is c=-8. Hence the product is (-8)/5=-8/5, so option A is correct. The negative sign must be retained because the constant term is negative, and the denominator is the leading coefficient rather than the middle coefficient. Option B loses the negative sign. Options C and D incorrectly use the coefficient 2 of x, which belongs to the sum relation -b/a and is not needed for the product. Direct factorisation is also possible over the real numbers, but the coefficient relation gives the result immediately and avoids unnecessary calculation.

Related tags

Product Of ZeroesVieta RelationQuadratic PolynomialCoefficientsPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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