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Sagot :

Bonsoir,

(4x - 3)² - 9 = 0
(4x - 3)² - 3² = 0
[(4x - 3) + 3][(4x - 3) - 3] = 0
(4x - 3 + 3)(4x - 3 - 3) = 0
4x(4x - 6)= 0
4x = 0   ou  4x - 6 = 0
x = 0/4     ou  4x = 6
x = 0     ou   x = 6/4 = 3/2

S = {0 ; 3/2}

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