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Mathematics 17 Online
OpenStudy (anonymous):

Please help ASAP!! What is the solution set of |x – 2| > 3?

OpenStudy (blurbendy):

x + 2 > 3 x > 1 All numbers greater than 1 would be in the solution set.

OpenStudy (zugzwang):

faulty...... 2 is greater than 1 but 2 is most emphatically not in the solution set

OpenStudy (anonymous):

@zugzwang, that's what I was going to say! It doesn't work..

OpenStudy (zugzwang):

The error was when it was (inaccurately) assumed that |x - 2| = x + 2 So back to the inequality |x - 2| > 3 Well, what if we just remove the absolute value? x - 2 > 3

OpenStudy (anonymous):

Would I have to solve for x - 2 > 3 and also x - 2 < 3?

OpenStudy (zugzwang):

It may be easier to see it without the the translation first.... What do you get if I give you |y| > 3 ?

OpenStudy (anonymous):

y > 3, and also y < -3 right?

OpenStudy (zugzwang):

Correct. Now just replace y with x - 2, and you have what you need :)

OpenStudy (anonymous):

So x > 5, and x < -1? :)

OpenStudy (zugzwang):

You got it :)

OpenStudy (zugzwang):

You can try it too, check those that are smaller than -1 and also check those larger than 5 You'll see it works every time

OpenStudy (anonymous):

Thanks!

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