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What is the discriminant D of 4x² + 4x + 1 = 0?

Answer and explanation

Correct answer: 0

For a quadratic equation ax² + bx + c = 0, the discriminant is calculated using D = b² − 4ac. Comparing 4x² + 4x + 1 = 0 with the standard form gives a = 4, b = 4, and c = 1. Substituting these values, D = 4² − 4(4)(1) = 16 − 16 = 0. Therefore option A is correct. Option C represents only b² and fails to subtract 4ac. Option B results from an incorrect partial calculation, and option D introduces a negative sign that is not produced by the formula. Since D = 0, the equation also has two equal real roots, which confirms the calculation.

Related tags

Quadratic EquationsDiscriminantCalculationNature Of RootsMathematicsClass 10 Mcq

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