alleryStart learning →If the discriminant of a cubic is zero, the cubic has
AThree unequal roots
BA multiple root
COnly complex roots
DNo real roots at all
Answer & Solution
Correct answer: B. A multiple root
A polynomial's discriminant vanishes exactly when it has a repeated root.
Keep practising Quadratic Equation
Browse all Quadratic Equation questions for CA Foundation, or explore more Quantitative Aptitude topics.
Related questions
The cubic (x − 2)²(x + 5) = 0 has the repeated rootHow many real roots does x³ − 8 = 0 have?A number plus its reciprocal is 5/2. The greater such number isThe product of two consecutive positive integers is 132. The smaller isA rectangle has perimeter 34 m and area 60 m². Its longer side isA father is 3 times his son's age. In 10 years he will be twice as old. The son is nowIf α and β are roots of x² − 5x + 4 = 0, then α² + β² isDividing ax² + bx + c = 0 by a gives x² + px + q = 0, where p and q are