Given the soulution of the inequality (x-3)(x+1) > 0.
The answer is X < -1 and x > 3. Can anyone explain how to get the answer please?
Maths, x=...? Please Help.
2008-02-01 2:25 am
回答 (3)
2008-02-01 2:43 am
✔ 最佳答案
(x-3)(x+1) > 0consider(x-3)(x+1) =0
x=3 or-1
put x= a no. between -1 and 3(e.g.0) into y=(x-3)(x+1)
y=-3＜0
so -1＜x＜3 is not the solution
so x< -1 or x > 3
參考: me
2008-02-01 2:42 am
(x-3)(x+1) > 0
x > 3 or x > -1
(x-3) 或 (x+1)必然會=0
因為:
2x0=0
5x0=0
20x0=0
所以:
(x-3) > 0 or (x+1) > 0
x > 3 or x > -1
希望你會明啦!!!!!!!!!!!!!!!!!!!!!!!!
x > 3 or x > -1
(x-3) 或 (x+1)必然會=0
因為:
2x0=0
5x0=0
20x0=0
所以:
(x-3) > 0 or (x+1) > 0
x > 3 or x > -1
希望你會明啦!!!!!!!!!!!!!!!!!!!!!!!!
參考: 自己
2008-02-01 2:34 am
(x-3)(x+1) > 0
x'square + x - 3x - 3 > 0
x'square - 2x > 3
... 之後唔知了... 太耐無計數, 唔記得晒了 =.=
x'square + x - 3x - 3 > 0
x'square - 2x > 3
... 之後唔知了... 太耐無計數, 唔記得晒了 =.=
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