Thread: Just Checking

Im just wondering if some this question is right?

|7 - x| = 9
|x| = 9 - 7
x = 2.

I was wondering if it would be a negitive 2 or a positive. Thanks!

Originally Posted by omgitzbella

Im just wondering if some this question is right?

|7 - x| = 9
|x| = 9 - 7
x = 2.

I was wondering if it would be a negitive 2 or a positive. Thanks!

This is not correct. To get rid of the absolute value bars, you need to square both sides of the equation:




You take it from here. (And make sure to check your solutions back in the original equation.)

-Dan

Think of what can be if .

Obviously you can have and , so we can have:



or



So the solutions are

Thank you =)