Math Is Fun Forum

soha

Real Member

Registered: 2006-07-07

Posts: 2,530

Find the LCM of the following expression:-

Find the LCM of the following expression:-

the expressions are:-

3(a-1), 2(a-1)² , ( a²-1)

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luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: Find the LCM of the following expression:-

note that (a²-1) can be written as (a+1)(a-1)

thus, the highest common factor of the three expressions is (a-1)
thus, the lowest common multiple is 3(a-1)×2(a-1)²×( a²-1)/(a-1)² = 6(a-1)(a²-1)

Last edited by luca-deltodesco (2008-04-29 03:19:17)

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Dragonshade

Member

Registered: 2008-01-16

Posts: 147

Re: Find the LCM of the following expression:-

oops didnt know its to get the LCM lol , fixed

Last edited by Dragonshade (2008-04-29 03:19:40)

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Find the LCM of the following expression:-

Why not 6(a+1)(a-1)(a-1)   ??  Just wondering?

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TheDude

Member

Registered: 2007-10-23

Posts: 361

Re: Find the LCM of the following expression:-

Why not 6(a+1)(a-1)(a-1)   ??  Just wondering?

It is John.  6(a+1)(a-1)(a-1) = 6(a-1)(a^2-1), which is what luca said.

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