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OpenStudy (braydonlevi99):
\[|x-4| + 9 = 3\]
pooja195 (pooja195):
Any ideas on where to start?
OpenStudy (braydonlevi99):
Doesn't it turn to \[|x+4| +9 = 3\]
pooja195 (pooja195):
Nope,try again.
We want to isolate the x so we would subtract 9 from both sides to begin with .
\[\huge~\rm~\bf~|x+4|+9-9=3-9\]
what would we be left with?
OpenStudy (braydonlevi99):
\[|x+4| = -6\] ?
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OpenStudy (braydonlevi99):
Then add the 4?
OpenStudy (braydonlevi99):
x = -2 ?
pooja195 (pooja195):
No. It would be |x−4|=-6
and we can't do anything else with it because there's a negative solution.
Absolute values cannot have a negative solution (a value less than 0)
OpenStudy (braydonlevi99):
I'm so freaking confused.
pooja195 (pooja195):
On what part?
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OpenStudy (braydonlevi99):
All
OpenStudy (braydonlevi99):
You've confused me.
OpenStudy (phi):
do you know what
| -9 | simplifies to ?
OpenStudy (braydonlevi99):
To 9
OpenStudy (phi):
what about
| -1 | ?
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OpenStudy (braydonlevi99):
1
OpenStudy (phi):
now think about this:
if you put a negative number inside the | | you get a positive number when you simplify. sound right ?
OpenStudy (phi):
for example | -1 | =1
|-2| = 2
and so on...
OpenStudy (phi):
and if you put in a positive number example:
| 9| = 9
we get a positive number after simplifying.
in other words, no matter what we put inside the | |, we get out a positive number
and that means *it is not possible* for
| any number you can think of | = -6
it can't happen.
OpenStudy (phi):
pooja was explaining there is no solution to your equation.