• Welcome! The new FreeMathHelp.com forum is live. We've moved from VB4 to Xenforo 2.1 as our underlying software. Hopefully you find the upgrade to be a positive change. Please feel free to reach out as issues arise -- things will be a little different, and minor issues will no doubt crop up.

Graphing Absolute Value Inequality: 9|x - 2| - 10 >= -64

jennie

New member
Joined
Aug 21, 2017
Messages
3
I have a question. What's the answer to 9|x-2|-10>=-64? I thought it was all real numbers, but my teacher said it was no solution since absolute value can't equal a negative. Thanks in advance.
 

mmm4444bot

Super Moderator
Staff member
Joined
Oct 6, 2005
Messages
10,140
What's the [solution for] 9|x-2| - 10 >= -64 ?

I thought it was all real numbers, but my teacher said it was no solution since absolute value can't equal a negative.
I agree with your solution; your teacher might have been thinking about a different situation.

The inequality symbol ≥ means greater than OR equal.

As long as the left-hand side evaluates to a number that is greater than -64, the inequality is true. This happens for any value of x.

If you solved the inequality by hand, you ought to have reached this:

|x - 2| ≥ -6

This shows that x can be any Real number because |x-2| is non-negative, and any non-negative number is greater than -6. :cool:
 

mmm4444bot

Super Moderator
Staff member
Joined
Oct 6, 2005
Messages
10,140
Graphing each side of the given inequality is another way to solve it.

The graph of the left-hand side (green) lies entirely above the graph of the right-hand side (red).

In other words, at each value of x, the value of y on the green graph is greater than the value of y on the red graph.
 

Attachments

Top