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The discriminant of the quadratic equation $ax^2+bx+c=0$ is
A$b^2 + 4ac$
B$4ac - b^2$
C$\sqrt{b^2-4ac}$
D$b^2 - 4ac$
Answer & Solution
Correct answer: D. $b^2 - 4ac$
1. The discriminant is the quantity under the root in the quadratic formula.
2. It equals $D = b^2 - 4ac$.
3. Its sign decides the nature of the roots.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch10 'Quadratic Equations', §10.4_
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