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Réponse :

Explications étape par étape

Bonsoir

exercice 1

x

x-10

(x-10)² = x² -20x +100

x² -20x +100 -x²=

-20x +100 = -340

-20x =-340 -100

-20x =-440

x = 440/20 = 22

Exercice 2

Mathilde:

x

9x

9x-8

Paul:

x

-3x

-3x+31

9x-8 = -3x+31

9x+3x = 31 + 8

12x =39

x = 39/12

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