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If p(x) = 2x² − 7x + 5, what is the difference between the sum and product of its zeroes?

Answer and explanation

Correct answer: 1

For ax² + bx + c, if the zeroes are α and β, then α + β = −b/a and αβ = c/a. In this polynomial, a = 2, b = −7, and c = 5. Hence the sum is −(−7)/2 = 7/2, while the product is 5/2. The required difference is sum minus product: 7/2 − 5/2 = 2/2 = 1. Therefore option A is correct. Option B would result from an arithmetic error, option C confuses the reciprocal coefficient relationship, and option D does not follow from either standard relation. The calculation uses the coefficient formulas directly, so solving for the individual zeroes is unnecessary.

Related tags

PolynomialsZeroesVieta-FormulasPolynomials In One VariableMathematicsClass 10 Mcq

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