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Utveckla med kvadreringsreglerna

När uttryck på formen (a+b)2 eller (a−b)2 ska utvecklas kan man använda kvadreringsreglerna:

(a + b)^{2} = a^{2} + 2 a b + b^{2} eller (a - b)^{2} = a^{2} - 2 a b + b^{2} .

Exempelvis blir

(x−3)2=x2−6x+9.

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