minouch76 minouch76

08-12-2017
Mathematics

contestada

Démontrer que x²-4x+5=(x-2)²+1 ; En déduire que x²-4x+5=0 n'a pas de solution

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rebelzane1 rebelzane1

08-12-2017

1st: toute valeur de x rend I'équation vraie
tous les nombres réels

2nd: résoudre l'équation pour x en trouvant a, b et c du quadratique puis en appliquant la formule quadratique
x = 2 ± i

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