SOLUTION: Please help! I do not understand any of this! Solve the following inequality 63x-32>63/x a.) Is the point x=0 included in the solution set of the inequality? b.) are the oth

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Question 969763: Please help! I do not understand any of this!
Solve the following inequality 63x-32>63/x
a.) Is the point x=0 included in the solution set of the inequality?
b.) are the other finite end points of the interval included in the solution set?
c.) what is the solution set? (in interval notation)

Found 2 solutions by MathLover1, Edwin McCravy:
Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!
...move terms containing to one side
...both side multiply by



...factor




solutions:
if then
if then
a.) Is the point included in the solution set of the inequality?
answer is because we were looking for solutions () greater then , second of all is denominator in ,and
is not included EVEN if we simplify it
b.) are the other finite end points of the interval included in the solution set?

c.) what is the solution set? (in interval notation)
(,) U (,)


Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
Although the other tutor got the right answer, she is incorrect
for multiplying both sides of the inequality by the variable x.
That's because a variable x might not be positive, and if you
multiply through by a negative, that would reverse the > to <.
Also she did not use test values on the intervals.  

Here is a correct solution:

Solve the following inequality 63x-32>63/x


Get 0 on the right side by subtracting  from both sides:



Get the LCD = x on the left side:





Factor the numerator on the left:



We find all the critical numbers.  They are the values
obtained by setting the numerator=0 and the denominator=0

The numerator (7x-9)(9x+7) when set equal to 0 gives 
critical numbers  and 
The denominator x when set equal to 0 gives the critical
number 0.

We draw a number line and mark the critical numbers on it,
in order from smallest to largest.

-----o------o--------------------o--------------
   -7/9     0                   9/7    

We have 4 intervals to test by substituting a test point in the interval:
1. Left of , which is 
2. Between  and , which is 
3. Between  and , which is 
4. Right of , which is 

1. The easiest number in  to test in the original is x = -1



 

That's false so the solution set does not include 

2. The easiest number in  to test in the original is x = -.1



 

That's true so the solution set does include 

3. The easiest number in  to test in the original is x = 1



 

That's true so the solution set does include 

3. The easiest number in  to test in the original is x = 2



 

That's true so the solution set does include 

None of the critical numbers are part of the solution since the
symbol is > and not ≥.

So the solution set is:




a.) Is the point x=0 included in the solution set of the inequality?
No because if we substitute x=0,



It is meaningless to divide by zero.


b.) are the other finite end points of the interval included in the solution set?
No because the symbol is > and not ≥

c.) what is the solution set? (in interval notation)



Edwin

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