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Maths Question
Mar 11, 2013 at 3:27pm
Mar 11, 2013 at 3:27pm UTC
Script Coder
(1468)
Sorry for the horrible handwriting and drawings.
http://picpaste.com/Question-zdfK0hLF.png
NOTE: It deletes itself in 6 hours from posing
EDIT:
If ab<0
then,
a<0 b>0
OR
a>0 b<0
Last edited on
Mar 11, 2013 at 3:43pm
Mar 11, 2013 at 3:43pm UTC
Mar 11, 2013 at 3:45pm
Mar 11, 2013 at 3:45pm UTC
kbw
(9488)
What's the question?
Mar 11, 2013 at 4:12pm
Mar 11, 2013 at 4:12pm UTC
tition
(887)
Your problem
should
can be solved like this.
Solve:
(x+2)(x-2)<0.
Therefore (x-2)<0 and (x+2)>0 or (x-2)>0 and (x+2)<0. The latter is not possible because (x-2)>0 implies (x+2)>0. Therefore the solution to the problem is -2<x<2.
Last edited on
Mar 11, 2013 at 4:13pm
Mar 11, 2013 at 4:13pm UTC
Mar 11, 2013 at 4:38pm
Mar 11, 2013 at 4:38pm UTC
Script Coder
(1468)
tition
wrote:
The latter is not possible because (x-2)>0 implies (x+2)>0.
I do not understand how x-2>0 implies that x+2>0, in fact as far as I know it implies the opposite.
@kbw please click on the (more than likely) blue underlined part of my first post.
Mar 11, 2013 at 4:57pm
Mar 11, 2013 at 4:57pm UTC
atropos
(184)
Script Coder
wrote:
tition wrote:
The latter is not possible because (x-2)>0 implies (x+2)>0.
I do not understand how x-2>0 implies that x+2>0, in fact as far as I know it implies the opposite.
x-2 > 0 means that x > 2.
Therefore, x+2 > 2+2 > 0.
Mar 11, 2013 at 5:08pm
Mar 11, 2013 at 5:08pm UTC
ResidentBiscuit
(4459)
Script Coder
wrote:
I do not understand how x-2>0 implies that x+2>0, in fact as far as I know it implies the opposite.
x - 2 > 0
x > 2
x + 2 > 0
x > -2
In English, if x is greater than two, than x has to be greater than -2.
Mar 11, 2013 at 7:02pm
Mar 11, 2013 at 7:02pm UTC
Script Coder
(1468)
I understand, thanks guys.
Topic archived. No new replies allowed.
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