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If the discriminant of a quadratic equation is zero, the roots are
Areal and distinct
Bnot real
Cimaginary and distinct
Dreal and equal
Answer & Solution
Correct answer: D. real and equal
1. When $b^2-4ac=0$, the two roots coincide.
2. So the roots are **real and equal** (a repeated root).
3. Both roots equal $-\dfrac{b}{2a}$.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch10 'Quadratic Equations', §10.4_
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