Posted by **Aria** on Tuesday, August 2, 2011 at 1:58am.

I am stumped by these two LCM questions for some reason.

Find The LCM for

#1

2(R-7) and 14(R-7)

#2

(1+4r), (1-16r^2), and (1-4r)

It seems like #1 is already at the LCM

and #2 would be (1+4r)(1-4r)

Am I even vaguely correct?

Thanks for your help.

- Algebra -
**MathMate**, Tuesday, August 2, 2011 at 8:53am
As you probably know, if one number is a multiple of the other, the bigger number is the LCM of the two.

Post your exact answer to #1 to confirm if you wish.

For #2, you are more than vaguely correct, but you do not appear to have any justification of your response.

You can confirm your thoughts by dividing the LCM by each of the three values. If they all divide without remainder, *and* there is no common factor between the quotients, the answer is correct.

For example,

If 60 is the LCM of 5,6,15, then

60/5=12 has no remainder

60/6=10 has no remainder

60/15=5 has no remainder.

However,

5,10 and 12 have a common factor of 2, so 60 is *not* the LCM, but 60/2=30 is!

Feel free to post your justification of your answer along the lines above.

## Answer this Question

## Related Questions

- Math - Find the LCM of 11(s-3) and 33(s-3). LCM of 11 is 11*1 LCM of 33 is 3*11 ...
- Math - Find the LCM and GCF of the following numbers: 1) 2016 and 756 2) 10140 ...
- algebra - 1.FIND THE LCM OF 10X^7 AND 50X^4 2.FIND THE LCM OF x^2 -36 AND x^2 + ...
- Math - Can someone check my answers for me pls? True or False LCM of 10 and 18 ...
- math, algebra - Can someone check this for me : Find the gcf for each of hte ...
- algebra - Find the LCM 10b^6 c^6, 5b^5 c^4, 14b^3 c^7 What is the LCM? I came up...
- algebra - Find the LCM 10b^6 c^6, 5b^5 c^4, 14b^3 c^7 What is the LCM? I came up...
- Algebra - Could I get some help Please!!!!!!!!! (1) Find the LCD 3/3v^2-3v-7/3v-...
- ALGEBRA - I have the answer and would love confirmation. VERY APPRECIATED! Find ...
- ALGEBRA/PLEASE HELP - have the answer and would love confirmation. VERY ...

More Related Questions