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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,807
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What Sugarwood said.
factors of 15 are (1,15) or (3,5). The 2 at the beginning is going to be multiplied by one of the others.
2*1 and 1*15, with either of those being negative, there's no way to add them together and get 7. (same goes for 2*15 and 1*1)
2*3 and 1*5, with either one of these being negative and added, there's no way to get a -7, but, if you swap the 3 and 5...
2*-5 and 1*3, you get -10 and +3 which will give you -7.
that's the mental process for factoring this sort of equation. Once it's factored, you end up with what Sugarwood said.
__________________
Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa  SOLD 2004 - gone but not forgotten
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