<prompt> Sehemu ya grafu ya fxax3bx2cxd imeonyeshwa hapa chini.Je, thamani ya 8a-4b2c-d ni nini?asykuagiza grafu; ukubwa 7 cm; halisi lsf0.5; pen dpslinewidth0.7fontsize10; defaultpendps; kalamu dsnyeusi; xmin halisi-3.25,xmax4.25,ymin-9.25,ymax4.25;kalamu cqcqcqrgb0.75,0.75,0.75;gridi kalamu gslinewidth0.7cqcqcqlinetype2 2; gx1,gy1 halisi;kwaiceil halisixmingxgx;isakafuxmaxgxgx;igx chorai,ymin--i,ymax,gs; kwareal iceilymingygy;ifloorymaxgygy;igy drawxmin,i--xmax,i,gs;Laxis ya lebo; laxis.pfontsize10;xaxis,xmin,xmax,Tickslaxis,Hatua1.0,Ukubwa2,NoZero,Mishale6,juukweli; yaxis,ymin,ymax,Tickslaxis,Hatua1.0,Ukubwa2,NoZero,Mishale6,juukweli;f1 halisix halisireturn xx-1x-28; choragrafuf1,-3.25,4.25,upana wa mstari0.75;klipuxmin,ymin--xmin,ymax--xmax,ymax--xmax,ymin--mzunguko;asy  <response>: Kumbuka kuwa f-2 a-8b4c-2d. Kwa hivyo, 8a-4b2c-d -f-2.Kwa vile pointi -2,-3 iko kwenye grafu ya fx, tunakisia kuwa -f-2 --3 3. 