✨ 最佳解答 ✨
4x^2 -12x +1 = 0
4(x^2 -3x) +1 = 0
4(x -3/2)^2 +1 -4* 9/4 = 0
4(x -3/2)^2 -8 = 0
4x^2 +(2m -10)x +64 = 0 為完全平方式,
2___8
2___8
=> 2m -10 = 32, m = 21
或
2___-8
2___-8
=> 2m -10 = -32, m = -11
或
-2___8
-2___8
=> 2m -10 = -32 (同上)
或
-2___-8
-2___-8
=> 2m -10 = 32 (同上)