The photograph below shows a bouncing ball in front of an illuminated grid. The heights oh the balls bounces make a geometric se
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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 
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. 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.