SOLUTION: |4-x|<5 I dont get the step your suppose to do. Do you subtrack first or what?

Algebra ->  Absolute-value -> SOLUTION: |4-x|<5 I dont get the step your suppose to do. Do you subtrack first or what?      Log On


   



Question 127512: |4-x|<5
I dont get the step your suppose to do. Do you subtrack first or what?

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
abs%284-x%29%3C5 Start with the given inequality


Break up the absolute value (remember, if you have abs%28x%29%3C+a, then x+%3E+-a and x+%3C+a)

4-x+%3E+-5 and 4-x+%3C+5 Break up the absolute value inequality using the given rule


-5+%3C+4-x+%3C+5 Combine the two inequalities to get a compound inequality



-9+%3C+-x+%3C+1 Subtract 4 from all sides


9+%3E+x+%3E+-1 Divide all sides by -1. This will isolate x. Remember, dividing by a negative number flips the inequality signs.


-1%3Cx%3C9 Rearrange the inequality

----------------------------------------------------

Answer:

So our answer is

-1%3Cx%3C9


which looks like this in interval notation





if you wanted to graph the solution set, you would get

Graph of the solution set in blue and the excluded values represented by open circles