Parabola o rany julek: Która z poniższych krzywych to parabola? a) x² + 2xy +y²−2x −2y +1 = 0 b)9x² +24xy +16y²+125y =0 c)x² +xy +y² − 3x − 3y = 0

sd: b)

hanecka,pudel i pipel: f(x;y)=ax² + 2bxy +cy² + 2dx + 2ey f'_x=2ax+2by+2d=0⇔ax+by=−d f'_y=2bx+2cy+2e=0⇔bx+cy=−e ________________________________ a)2x+2y=1 2x+2y=1→0=0 b)9x+12y=0 12x+16y=0→0=−62.5→parabola c)2x+0.5y=1.5 0.5x+2y=1.5→x=0.6,y=0.6