The Discriminant
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Hook
See the future
Before solving a quadratic, you can predict how many solutions it has — and whether they're real or complex — just by looking at one number: b² − 4ac, the discriminant. No formula needed, just a glance.
Before solving a quadratic, you can predict how many solutions it has — and whether they're real or complex — just by looking at one number: b² − 4ac, the discriminant. No formula needed, just a glance.