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If p(x)=2x^2-7x+3, what is the sum of its zeroes?

Answer and explanation

Correct answer: 7/2

For a quadratic polynomial ax^2+bx+c with zeroes alpha and beta, Vieta's relation gives alpha+beta=-b/a. In p(x)=2x^2-7x+3, the coefficients are a=2 and b=-7. Therefore the sum is -(-7)/2=7/2, making option A correct. A direct factorisation confirms this: 2x^2-7x+3=(2x-1)(x-3), whose zeroes are 1/2 and 3. Their sum is 1/2+3=7/2. Option B results from forgetting the negative sign in Vieta's relation. Options C and D incorrectly use the constant term, which is involved in the product of the zeroes, not their sum. Thus the coefficient relationship is sufficient and the factorisation provides an independent check.

Related tags

Sum Of ZeroesVieta RelationQuadratic PolynomialCoefficientsPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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