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January 30, 2015

January 30, 2015

Posted by **Anonymous** on Thursday, April 22, 2010 at 4:11pm.

a - 10a + 21

- help! -
**maja**, Thursday, April 22, 2010 at 4:25pmI think that you didnt write the question well , because it would me much more logically that your homework goes like this a^2 - 10a + 21

then this is :

a^2 - 7a-3a + 21

a (a-7) – 3 (a-7)

(a-3)(a-7)

a - 10a + 21 - like this is : -9a + 21 = -3(3a-7)

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