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If the polynomial p(x) = x² + 2x + c has no real zero, which condition on c is correct?

Answer and explanation

Correct answer: c > 1

A quadratic polynomial ax² + bx + c has no real zero when its discriminant b² − 4ac is less than 0. Here, the discriminant is (2)² − 4(1)(c) = 4 − 4c. Thus, 4 − 4c < 0 gives c > 1. For c = 1, the discriminant is zero and the polynomial has one real zero, so option B is incorrect. Exam tip: Always check the discriminant to determine the number of real zeroes of a quadratic polynomial.

Related tags

DiscriminantReal ZeroesQuadratic PolynomialPolynomial ParameterPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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