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Sagot :

Bonjour,

Résoudre:

(3x+1)^2=(5x-3)^2

(3x+1)² - (5x-3)²= 0  est sous forme de a²-b²= (a-b)(a+b) <=> IR

On factorise,

(3x+1-5x + 3)(3x+1+5x-3)= 0

(-2x+4)(8x-2)= 0

-(2x-4)(8x-2)= 0

-2(x-2)(4x-1)= 0

On résout,

x-2= 0  ou   4x-1= 0

x= 2             x= 1/4

S= { 2, 1/4 }

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