✨ 最佳解答 ✨
x^2 + nx = 125 = 5 × 25
x^2 + nx - 125 = 0
(x + 5)(x - 25) = 0 或 (x - 5)(x + 25) = 0
x = -5 or 25 或 x = 5 or -25 (平方不會是是負數,不合)
(x + 5)(x - 25) = 0
x^2 - 20x - 125 = 0
✨ 最佳解答 ✨
x^2 + nx = 125 = 5 × 25
x^2 + nx - 125 = 0
(x + 5)(x - 25) = 0 或 (x - 5)(x + 25) = 0
x = -5 or 25 或 x = 5 or -25 (平方不會是是負數,不合)
(x + 5)(x - 25) = 0
x^2 - 20x - 125 = 0
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