anonymous
  • anonymous
Solve |2x -5| > 7.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
x > 6 or x < -1 -1 < x < 6 x > 6 and x < -1
anonymous
  • anonymous
You just solved your own problem.
anonymous
  • anonymous
? lol those are the multiple choice :D @Brenar

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anonymous
  • anonymous
Ah, makes much more sense. First off, since this is an absolute value inequality you'll have to split it into two inequalities as such: \[-7>2x-5>7\] You have an idea of where to begin?
anonymous
  • anonymous
B..Probably?
anonymous
  • anonymous
Do you understand how I set up the inequality?
anonymous
  • anonymous
? not really
zzr0ck3r
  • zzr0ck3r
@Brenar this is wrong, a number cant be greater than 7 and less than -7 at the same time...
anonymous
  • anonymous
x>6 or x<-1
zzr0ck3r
  • zzr0ck3r
This is how we do these |2x-5|>7 so 2x-5>7 2x-5<-7 solve these x>6 or x<-1
zzr0ck3r
  • zzr0ck3r
ie |a-b|>c <===> a-b>c or a-b<-c
zzr0ck3r
  • zzr0ck3r
−7>2x−5>7 ^^^ this makes no sense.
zzr0ck3r
  • zzr0ck3r
that implies, by transitivity, that 7<-7
zzr0ck3r
  • zzr0ck3r
you are thinking of |a-b|
anonymous
  • anonymous
l2x-5l>7 +5 +5 _____________ 2x > 12 then divide by 2 and you get x>6
zzr0ck3r
  • zzr0ck3r
nope, regular algebra does not work on absolute values.
zzr0ck3r
  • zzr0ck3r
|2x|+5 != |2x+5|
zzr0ck3r
  • zzr0ck3r
or simply plun in -3 to see it is true:)
anonymous
  • anonymous
yeah but i use that for the second solution
zzr0ck3r
  • zzr0ck3r
we showed both solutions, and what you typed is not correct
zzr0ck3r
  • zzr0ck3r
l2x-5l>7 +5 +5 ^^^is not right
anonymous
  • anonymous
mathway.com
zzr0ck3r
  • zzr0ck3r
I don't need a website to tell me that |x|+5 is not the same as |x+5|
zzr0ck3r
  • zzr0ck3r
I know its not:)
zzr0ck3r
  • zzr0ck3r
it would be right if you wrote 2x-5>7 +5 +5
zzr0ck3r
  • zzr0ck3r
but not with the | |
anonymous
  • anonymous
yes with the absolute value sign
zzr0ck3r
  • zzr0ck3r
ok ....
zzr0ck3r
  • zzr0ck3r
then |x|+5 = |x+5|
zzr0ck3r
  • zzr0ck3r
and so |-3|+5 = 8 = 2 = |-3+5|
zzr0ck3r
  • zzr0ck3r
so 2=8
zzr0ck3r
  • zzr0ck3r
what is |-3+5|? what is |-3|+5?
zzr0ck3r
  • zzr0ck3r
you see now?
anonymous
  • anonymous
and how much math experience do you have?
zzr0ck3r
  • zzr0ck3r
im about to graduate
zzr0ck3r
  • zzr0ck3r
with honors with a math degree:)
zzr0ck3r
  • zzr0ck3r
you don't have to trust me, show me where you read it and ill show you how you read it wrong.
anonymous
  • anonymous
take a calculator and repeat the action. also check mathway.com its a calculator.
anonymous
  • anonymous
middle school?
zzr0ck3r
  • zzr0ck3r
college...
anonymous
  • anonymous
proud of you. i just logged on today. doesnt matter to me
zzr0ck3r
  • zzr0ck3r
you asked? maybe grow up....im trying to help because you are telling someone how to do something wrong.
zzr0ck3r
  • zzr0ck3r
answer these questions and you should be able to understand why what is |-3+5|? what is |-3|+5?
anonymous
  • anonymous
hahaha says the person with a name they cant even spell correctly. certaintly not graduating with an english major
zzr0ck3r
  • zzr0ck3r
your name is cristina17?
anonymous
  • anonymous
yes captain O
anonymous
  • anonymous
i know...it is
anonymous
  • anonymous
try mathway.com
anonymous
  • anonymous
thats what i said
zzr0ck3r
  • zzr0ck3r
lol omg what is |-3+5|? what is |-3|+5? now ARE THEY THE SAME???????????????????????
anonymous
  • anonymous
haha sorry...
zzr0ck3r
  • zzr0ck3r
think for yourself....don't run to the website:)
anonymous
  • anonymous
lol mathway.com
zzr0ck3r
  • zzr0ck3r
p.s. solving for x in |x|+5 = |x+5| is not the same thing as saying |x|+5 = |x+5| for all x.....
zzr0ck3r
  • zzr0ck3r
that statement is true if and only if x is 3
anonymous
  • anonymous
ok i got it now. use the multiple choice answers and work backwards l2(7)-5l>7...aka 9>7 l2(-2)-5l>7...aka 9>7
anonymous
  • anonymous
so the answer x > 6 and x < -1 is correct
zzr0ck3r
  • zzr0ck3r
yes
anonymous
  • anonymous
that is what i had said earlier...i just lacked the explanation

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