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September 19, 2014

September 19, 2014

Posted by **MARIAH** on Thursday, October 28, 2010 at 6:47pm.

1. 7a-21a^2/9a^2+6a+1 x 9a^2+6a+1/9a^2-1

2. 2a+2/8a+24 x 4x+12/2x^2-2

- math -
**Reiny**, Thursday, October 28, 2010 at 9:27pmYou 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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