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Mathematics 15 Online
OpenStudy (anonymous):

Which value of x is in the solution set of 2|x – 3| < 4?

hartnn (hartnn):

you won't get one value of x, you'll get set of values. first, isolate |x-3|, can u ?

OpenStudy (anonymous):

Options are 8,0,4,-1

hartnn (hartnn):

oh, you have options, good! then just plug in values one by one and see which options satisfy the equation....need help with that ?

OpenStudy (anonymous):

But they all worked for me

hartnn (hartnn):

let me do 1st option for you. x=8, lets check 2|8 – 3| < 4 2|5|<4 10<4 <------FALSE

OpenStudy (anonymous):

I don;t understand what i am doing incorrectly

OpenStudy (anonymous):

|x-3|<2 x-3< 2 or x-3<-2 x<5 or x<1 thus x=0

hartnn (hartnn):

you must know this : \(|-a|=a\)

OpenStudy (anonymous):

So let me try 4 2|x – 3| < 4 2|1|<4 2<4?

hartnn (hartnn):

correct! so, you got your answer.....

hartnn (hartnn):

2<4 is TRUE ,right ?

OpenStudy (anonymous):

Oha nd it cant be -1 cause of the | |s

OpenStudy (anonymous):

Thank you so much! This makes scene now

hartnn (hartnn):

it can't be -1 because 2|-1-3|<4 2|-4|<4 2(4)<4 8<4 <----FALSE!

hartnn (hartnn):

you got how |-4|=4

OpenStudy (anonymous):

Right It was throwing me off because of the - I thougfht it was -8<4

OpenStudy (anonymous):

Yes your example cleared it up for me

hartnn (hartnn):

here only thing required was |-a|=a ...remember this!

OpenStudy (anonymous):

*nods* Thank you

hartnn (hartnn):

*bows* welcome ^_^

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