SOLUTION: 4b/9 - 8b/12 (to subtract this do I need to find the LCD? When I do that I get -4b/3 as my answer)

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Question 994447: 4b/9 - 8b/12 (to subtract this do I need to find the LCD? When I do that I get -4b/3 as my answer)
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
4b/9 - 8b/12 (to subtract this do I need to find the LCD? When I do that I get -4b/3 as my answer)
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You have to find a common denominator. It doesn't have to be the least.
4b/9 - 8b/12
Reduce the 2nd term.
4b/9 - 2b/3
9 is obviously the CD.
4b/9 - 2b/3 = 4b/9 - 6b/9
= -2b/9