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For a quadratic equation $ax^2+bx+c=0$, the discriminant is:
A$4ac - b^2$
B$b^2 - 4ac$
C$b^2 + 4ac$
D$\sqrt{b^2-4ac}$
Answer & Solution
Correct answer: B. $b^2 - 4ac$
Discriminant D = b²−4ac determines the nature of roots.
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