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(2x+1)² = 0
x = - 1/2
2. 9x² - 6x + 1 = 0
(3x-1)² = 0
x= 1/3
3. 2x² -x -3 =0
(2x-3) (x+1) =0
x= 3/2 atau x= -1
2.
9x2-6x+1
(9x2-3x)(-3x+1)
3x(3x-1) -1(3x-1)
(3x-1)(3x-1)
3.
2x2-x-3
(2x2+2x)(-3x-3)
2x(x+1)-3(x+1)
(2x-3)(x+1)