<prompt> Tuseme fx ni kazi ya kimantiki kiasi kwamba 3fleftdfrac1xrightdfrac2fxxx2 for x sawa 0. Tafuta f-2.  <response>: Kuweka x -2, tunapata3 f kushoto -frac12 kulia - f-2 4.Kuweka x -frac12, tunapata3f-2 - 4 f left -frac12 kulia frac14.Kutatua milinganyo hii kama mfumo katika f-2 na f left -frac12 kulia, tunapata f-2 frac6720 na f left -frac 12 kulia frac4920. 