SOLUTION: I need help solving this inequality. I don't understand how to find the answer for both sides. 8th grade algebra for my homework. Thank You |3.5z|>|7|

Algebra ->  Inequalities -> SOLUTION: I need help solving this inequality. I don't understand how to find the answer for both sides. 8th grade algebra for my homework. Thank You |3.5z|>|7|      Log On


   



Question 210779: I need help solving this inequality. I don't understand how to find the answer for both sides. 8th grade algebra for my homework. Thank You
|3.5z|>|7|

Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
I need help solving this inequality. I don't understand how to find the answer for both sides. 8th grade algebra for my homework. Thank You


|3.5z| > |7|

The absolute value of 7 is just 7, so the right side
is just 7

|3.5z| > 7

Since 3.5 is positive, we may write
the left side as

3.5|z| > 7

Divide both sides by 3.5

3.5abs%28z%29%2F3.5+%3E+7%2F3.5

cross%283.5%29abs%28z%29%2Fcross%283.5%29+%3E+2

|z| > 2

So the distance any number which variable z can take 
on must be more than 2 units from 0, on either side
of 0, so the graph of the inequality on a number line is:

<================o-----------o===============>
 -7 -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7 

In interval notation the solution set is written:

         %22%28%22-infinity%22%22%22%2C%22-2%22%22%29U%282%2C%22infinity%22%29%22 

In set-builder notation the solution set is written

         {z|z<-2 OR z>2}

Edwin