posted by kiearra on .
factor the expression:
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 class-room 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