Sagot :
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
(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