recognizing a quadratic equation(急)

1)
12x(x的2次方)+x = 1/6
72x^2+6x-1 = 0
(12x-1)(6x+1) = 0
x = 1/12 0r - 1/6
2)(3x-5)[成個2次方] - (x-1)[都係成個2次方] = 0
9x^2 -30x +25 - (x^2-2x +1) =0
8x^2+32x+24 = 0
x^2+4x+3 = 0
(x+1)(x+3) = 0
x = -1 0r -3

2007-09-16 18:02:52 補充：
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