Andragradsekvationer och pq-formeln

Tio uppgifter om att lösa andragradsekvationer med pq-formeln och andra metoder.

10 questions · Upper secondary · Mathematics

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Hur lyder pq-formeln för ekvationen x² + px + q = 0?

Dicklyon, CC BY-SA 4.0
- x = p/2 ± √((p/2)² − q)
- x = −p ± √(p² − q)
- x = −p/2 ± √((p/2)² − q)
- x = −p/2 ± √((p/2)² + q)
Show the answer

x = −p/2 ± √((p/2)² − q)
Vilket av talen är en lösning till x² + 2x − 8 = 0?
- 8
- −2
- 4
- −4
Show the answer

−4
Ekvationen x² − 2x − 15 = 0 har lösningarna x = −5 och x = 3.
- True
- False
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False

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