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Exercice 10:
Résoudre les équations suivantes :
a) (2x + 7)2 = 100
b) (x + 1)2 -- 49 = 0
c) 2(x -- 4) + (x + 1)(x – 4) = 0
d) 5(x + 1) - (x + 1)(2x + 2) = 0
=

Sagot :

Réponse:

pour la a)

A = (2x + 7)^2 = 100

A = 4x^2 + 49 = 100

A = 4x = 100 - 49

A = 4x = 51

A = 51 ÷ 4

B = (x + 1)^2 - 49 = 0

B = x^2 + 1 - 49 = 0

B = x^2 = 0 - 1 + 49

B = x^2 = 48

B = 48 ÷ 2

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