What does “Discriminant” actually mean in Quadratic Equations, and why does it matter for JEE?
D = b² − 4ac tells the nature of the roots before you even solve: D>0 gives two real distinct roots, D=0 gives equal roots, D<0 gives complex roots.
In simple words: D = b² − 4ac tells the nature of the roots before you even solve: D>0 gives two real distinct roots, D=0 gives equal roots, D<0 gives complex roots. Getting Discriminant clear matters because JEE questions on Quadratic Equations usually test this idea directly, not just a formula you memorised.
Key point
Discriminant
Common mistake
thinking D<0 means 'no solution'.
Memory tip
D<0 still has two roots — they're complex conjugates.
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