Posted by MARIAH on Thursday, October 28, 2010 at 6:47pm.
You have to use brackets.
I think you mean ...
(7a-21a^2)/(9a^2+6a+1) (9a^2+6a+1)/(9a^2-1)
= 7a(1 - 3a)/(9a^2+6a+1) (9a^2+6a+1)/((3a-1)(3a+1))
= -7a/(3a+1)
the second one factors nicely too once you put the brackets in
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