Help!! I need help finding x.

2x – (7 + x)<x

2x - 7 - x <= x

x - 7 <= x

The x cancels out, so is the answer that circle with the diagonal line through it?

Printable View

- Jan 14th 2010, 06:23 PMashleydevosInequality
Help!! I need help finding x.

2x – (7 + x)__<__x

2x - 7 - x <= x

x - 7 <= x

The x cancels out, so is the answer that circle with the diagonal line through it? - Jan 14th 2010, 06:35 PMskeeter
- Jan 14th 2010, 06:36 PMBacterius

So this equality holds for any , because is indeed smaller than .

EDIT : erf Skeeter beat me to it :D - Jan 14th 2010, 08:01 PMashleydevos
How do you write it in interval notation then? [-7<= ∞)???

- Jan 14th 2010, 08:20 PMBacterius
No, no !

Regardless of the value of , the inequality holds, so I guess you could write this , or :

,

A less elegant but more direct way to write it could be : , .