can some1 point out my mistake over here? I can't seem to find my mistake n i think i may have a conceptual misunderstanding... thanks...
2 < x < 4
4 < x^2 < 16 (since x is definitely positively)
-5 < (x^2) - 9 < 7
-1/5 > 1 / [(x^2) - 9] > 1/7
the end results doesn't seem logical
can any1 help? thanks...
2007-11-16 18:08:12 · 4 answers · asked by YoherZ 1 in Science & Mathematics ➔ Mathematics
"-1/5 > 1 / [(x^2) - 9] > 1/7" is not right.
If one side is negative, and the other side is positive, then when you flip both sides, you can't change the direction of the inequality sign.
For example,
-2 < 3
-1/2 < 1/3
2007-11-16 18:13:30 · answer #1 · answered by sahsjing 7 · 0⤊ 0⤋
it appears your first three lines all say the same thing
line 4 .... should x = 3
it's a failure
as 1/0 is dead meat on the spot
there is our problemo
all the best
2007-11-17 02:14:29 · answer #2 · answered by tom4bucs 7 · 0⤊ 0⤋
first two are exactly the same
2007-11-17 04:40:55 · answer #3 · answered by stuartelliott797 2 · 0⤊ 0⤋
..over limitation.
2007-11-17 02:21:23 · answer #4 · answered by Tuncay U 6 · 0⤊ 0⤋