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Utveckla med konjugatregeln

När två parenteser på formen (a+b) och (a−b) multipliceras kan man, istället för att multiplicera ihop dem på vanligt sätt, använda konjugatregeln:

(a+b)(a−b)=a2−b2.

Exempelvis blir (x+3)(x−3)=x2−9.

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