│x+3│=│x^2-9│
solve the equation/
f.4 amathz,,,solving equation with absolute value.
2008-10-21 3:09 am
回答 (2)
2008-10-21 5:08 am
✔ 最佳答案
As follows~圖片參考：http://i248.photobucket.com/albums/gg191/ncy_0916/maths208.jpg?t=1224508088
2008-10-22 17:15:37 補充：
你都可以將佢柝成 (x-3)(x+3)
│x+3│=│x^2-9│
│x+3│=│x+3││x- 3│
│x+3││x- 3│-│x+3│= 0
│x+3│(│x- 3│- 1) = 0
x + 3 = 0 or │x - 3│= 1 or -1
x = -3 or x = 2 or 4
2008-10-21 5:19 am
method 3:
│x+3│=│x^2-9│
│x+3│=│(x+3)(x-3)│
│x+3│=│(x+3)││(x-3)│
│(x+3)││(x-3)│- │x+3│= 0
│x+3│(│(x-3)│- 1) = 0
│x+3│= 0 or │(x-3)│= 1
x = -3 or x-3 = 1 or x-3 = -1
x = -3 or x = 4 or x = 2
│x+3│=│x^2-9│
│x+3│=│(x+3)(x-3)│
│x+3│=│(x+3)││(x-3)│
│(x+3)││(x-3)│- │x+3│= 0
│x+3│(│(x-3)│- 1) = 0
│x+3│= 0 or │(x-3)│= 1
x = -3 or x-3 = 1 or x-3 = -1
x = -3 or x = 4 or x = 2
參考: me
收錄日期: 2021-04-13 16:10:53
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