anonymous
  • anonymous
Solve |5x – 8| > 12. Answer {x| -0.8 < x < 4} {x| -4 < x < 4} {x| x > 4 or x < -0.8} {x| x < -4 or x > 0.8}
Mathematics
katieb
  • katieb
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TuringTest
  • TuringTest
what foes absolute value mean @ramirokool ?
TuringTest
  • TuringTest
*does
TuringTest
  • TuringTest
if we had |x|=2 what could x possibly be?

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anonymous
  • anonymous
The magnitude of a real number without regard to its sign.
TuringTest
  • TuringTest
right, so |x|=2 means x could be what two numbers?
anonymous
  • anonymous
a 4 and a 0.8 ? their should be a negative.
anonymous
  • anonymous
I got C on my sheet.
anonymous
  • anonymous
You divide.
TuringTest
  • TuringTest
|x|=2 means that we ignore the sign of x - that is all
TuringTest
  • TuringTest
|4|=4 that's not 2, so no
TuringTest
  • TuringTest
|0.8|=0.8 also not 2, so not correct
anonymous
  • anonymous
Go step by step.
TuringTest
  • TuringTest
I am, are you lost in what i just said?
anonymous
  • anonymous
Nope.
hba
  • hba
@TuringTest Dude he just needs the answer :D
TuringTest
  • TuringTest
@hba do not assume that, he's working with me right now
TuringTest
  • TuringTest
ok, so considering things like that |-6|=6, and |0.88|=0.88 what could |x|=2 possibly be?
anonymous
  • anonymous
2
TuringTest
  • TuringTest
or...?
anonymous
  • anonymous
no or.
TuringTest
  • TuringTest
yes or, what is |-2| ?
anonymous
  • anonymous
but if it in the box would it be postive?
TuringTest
  • TuringTest
yes, so |-2|=?
anonymous
  • anonymous
2 ?
TuringTest
  • TuringTest
right, so |x|=2 means x could be what TWO numbers?
hba
  • hba
Any thing which comes between | | < this becomes positive :)
anonymous
  • anonymous
-2 and 2
TuringTest
  • TuringTest
correct :)
TuringTest
  • TuringTest
so for |x|=y that means either x=y or -x=y
anonymous
  • anonymous
-x =y
TuringTest
  • TuringTest
so you problem is |5x – 8| > 12 based on what we just discussed, |5x - 8|>12 means that 12> what two expressions?
TuringTest
  • TuringTest
rather, 5x-8 could be what two numbers?
anonymous
  • anonymous
I still think it C cause that what I got, 0.8 and 4.
TuringTest
  • TuringTest
it's not C
TuringTest
  • TuringTest
|a|=b implies that either a=b or a=-b
anonymous
  • anonymous
My mistake D.
TuringTest
  • TuringTest
yes :)

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