兩邊同乘x
x^3 + 5x^2 + 25X = 0.
x^3 + 5(x^2 + 5x) = 0.
兩邊同加125.
125 = x^3 + 5(x^2 + 5x + 25) = x^3
兩邊同乘x
x^3 + 5x^2 + 25X = 0.
x^3 + 5(x^2 + 5x) = 0.
兩邊同加125.
125 = x^3 + 5(x^2 + 5x + 25) = x^3
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