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$- a = a \cdot i$

Kvadratroten ur ett negativt tal

- a

är inte reellt, men kan skrivas som ett imaginärt tal. Exempelvis är

- 4 = 4 \cdot i = 2 i .

Kvadratroten ur

- a

kan alltså skrivas som kvadratroten ur

a

multiplicerat med den imaginära enheten

i .

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