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When will p(x) = ax^2 + bx + c be a quadratic polynomial?

Answer and explanation

Correct answer: a ≠ 0

The governing concept is classification by polynomial degree. A polynomial is quadratic exactly when the highest power of its variable with a non-zero coefficient is 2. In p(x) = ax² + bx + c, the coefficient of x² is a. Therefore a must be non-zero, so a ≠ 0 is the required condition and option B is correct. If a = 0, the x² term disappears and the expression becomes bx + c, which may be linear or constant. The values b = 0 or c = 0 are not necessary: for example, 2x² + 0x + 3 is still quadratic, and 2x² + 5x + 0 is also quadratic. Thus the other options do not correctly state the defining condition.

Related tags

Quadratic-PolynomialDegreeCoefficientsPolynomialsPolynomials In One VariableMathematicsClass 10 Mcq

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