## LCD inquiry

Simplificatation, evaluation, linear equations, linear graphs, linear inequalities, basic word problems, etc.
magellan333
Posts: 4
Joined: Sun Jan 05, 2014 4:09 am
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### LCD inquiry

X-7, 3x-21, 6x

My answer was 3, x-7, 6x

Correct answer per the book is 6x, x-7.

What happened to the 3?

Posts: 136
Joined: Sun Feb 22, 2009 11:12 pm

### Re: LCD inquiry

X-7, 3x-21, 6x

My answer was 3, x-7, 6x
"Your answer" to what? What did the instructions tell you to do?
Correct answer per the book is 6x, x-7.
If the instructions said to get the factors for the LCD then this answer is right. You can see why here (the last bit of the lesson shows polys; the first part shows how to do it with numbers).
What happened to the 3?
What factors did you get? How did you get 3 NOT being a factor of 6?

magellan333
Posts: 4
Joined: Sun Jan 05, 2014 4:09 am
Contact:

### Re: LCD inquiry

The instructions were to find the LCD of the three. I factored as follows:

X-7 = x-7
3x-21 = 3(x-7)
6x=6x

Therefore my answer was x-7, 3 and 6x.

Posts: 136
Joined: Sun Feb 22, 2009 11:12 pm

### Re: LCD inquiry

The instructions were to find the LCD of the three. I factored as follows:

X-7 = x-7
3x-21 = 3(x-7)
6x=6x

Therefore my answer was x-7, 3 and 6x.
Okay. Now, after you've read the lesson in the link and factored the 6 in the 6x, what are you getting?