The difference between two rational numbers is always negative true or false?
2 answers:
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We need to FOIL that out and then get it into standard form to see what our A, B, and C are. FOILing gives us 
. If we move the 7 over by subtraction and set it equal to 0, we have 
. In order to avoid a negative leading coefficient, we can change all the signs to get 
so A = 1, B = 0, C = -18, first choice above.