math
posted by kiearra .
factor the expression:
10a^219a+7
ok I no how to start of which would be
(10a )(a+ )
but i don't no how to factor it from here

If you are in a classroom situation, then you should have been taught some kind of "method" to do these, just plain guessing works only up to a point.
there are actually two choices for the first terms
(10x..)(x...) or (5x....)(2x....)
at the back it would have to be
(..7)(...1) or (...+7)(...+1)
remember, after you make your choice, expand to see if you get the original. 
ok i get it now i just didn't no what to do with the middle number