SOLUTION: I came up with an incorrect answer for the following problem and I'm not sure why, can you assist me? Solve the absolute value inequality. Express the solution using interval no

Algebra ->  Inequalities -> SOLUTION: I came up with an incorrect answer for the following problem and I'm not sure why, can you assist me? Solve the absolute value inequality. Express the solution using interval no      Log On


   



Question 196829: I came up with an incorrect answer for the following problem and I'm not sure why, can you assist me?
Solve the absolute value inequality. Express the solution using interval notation and graph the solution set.
abs(4x) > 6
thanks!

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
abs%284x%29%3E6 Start with the given inequality


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

4x+%3C+-6 or 4x+%3E+6 Break up the absolute value inequality using the given rule




Now lets focus on the first inequality 4x+%3C+-6


4x%3C-6 Start with the given inequality


x%3C%28-6%29%2F%284%29 Divide both sides by 4 to isolate x



x%3C-3%2F2 Reduce


Now lets focus on the second inequality 4x+%3E+6


4x%3E6 Start with the given inequality


x%3E%286%29%2F%284%29 Divide both sides by 4 to isolate x



x%3E3%2F2 Reduce



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Answer:

So our answer is

x+%3C+-3%2F2 or x+%3E+3%2F2


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