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Falsk rot

När man löser ekvationer med balansmetoden finns det några enstaka fall som kan leda till att man får falska rötter, dvs. rötter som inte löser ursprungsekvationen. De uppkommer främst för rotekvationer, när man kvadrerar båda led eller multiplicerar med en variabel. För att undvika falska rötter används prövning för att kontrollera de svar man får fram.

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