Tìm x:

a, x\(^2\) - ( x + 2 )\(^2\) = 3

b, - 4x ( x -1 ) + ( 2x + 1 )\(^2\)

c, ( x + \(\dfrac{1}{2}\) )\(^2\) - x\(^2\) + 3 = 0

d, ( x - 2 )\(^2\) = x\(^2\) - 3x

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