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X^2 = 1 (2X+1)(2X+1) = 0
X = √1 => X = 1 ambil salah satu ,jadi 2X+1 = 0
2X = -1 => X = -1/2
c. -3X^2-5X+2 = 0
(3X-1)(-X-2) = 0
3X-1 = 0 dan -X-2 = 0
3X = 1 -X = 2
X = 1/3 atau X = -2
d. 2X^2-X-3 =0
(2X-3)(X+1) = 0
2X-3 = 0 dan X+1 = 0
2X = 3
X = 3/2 atau X = -1
e. X^2-X+1/4 = 0
maaf saya bingung hehehe...