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Använd 2:a kvadreringsregeln

Kvadreras en differens med två termer kan uttrycket skrivas om med andra kvadreringsregeln:

(a−b)2=a2−2ab+b2.

Regeln kan även användas "åt andra hållet" dvs. uttryck på formen a2−2ab+b2 kan skrivas (a−b)2.

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