Réponses

2013-05-09T17:28:01+02:00

12x² = 15 => x² = 15/12 = 5/4 => x = + ou - V5/2

(3x-2)²= (9x-6)(2x+5) => (3x-2)² - 3(3x-2)(2x+5) = (3x-2)(3x-2 - 6x - 15) = (3x-2)(-3x-17) = 0

x =2/3 ou x = -17/3

 

2013-05-09T18:44:29+02:00

 

 

 

 (3x-2)²=(9x-6)(2x+5)

3x -2*3x+2=9x-6* 2x+5

3x -2* 3x+2=9x-2x* 6+5

3x -2*3x+2= 7x * +11

3x-2 * 3+2-7x * 11=0    

3x-6+2-77x=0

3x-77x-6+2=0

-74x-4=0

-74x=+4

-x= 4/74

x= -4/74

x= -2/37