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July 4, 2015

Homework Help: Algebra--Correction?

Posted by Anonymous on Tuesday, October 13, 2009 at 5:51pm.

Solve the absolute value equation.
I I will represent absolute value

I 2x-4 I -1= 11

Would the solutions be x=8 and x= -4?

* Algebra - Reiny, Tuesday, October 13, 2009 at 5:41pm

I just mentally tested x=8.
It did not work in your equation

take the -1 to the other side and follow the steps I just showed you in the previous problem


I did take the -1 to the other side. Here's exactly how I did it:

I 2x-4 I -1=11
added 1 to both sides
That came out to:
I 2x-4 I =12
I separated it into
2x-4=12 and 2x-4=-12
add 4 to both sides of each
2x=16 and 2x=-8
divide each by two
x=8 and x= -4

What part of my figuring is off?

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