find the equation of parabola with focus is( - 1 , 2) and directrix is X - 2y - 15 =0
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(x+1)2+(y+2)2=[x−2y+312+22−−−−−√]2(x+1)2+(y+2)2=[x−2y+312+22]2
5[(x2+2x+1)+(y2+2y+4)]=(x−2y+3)25[(x2+2x+1)+(y2+2y+4)]=(x−2y+3)2
⇒5[(x2+2x+1)+(y2+4y+4)]=x2+4y2+9−4xy−12y+6x⇒5[(x2+2x+1)+(y2+4y+4)]=x2+4y2+9−4xy−12y+6x
⇒5x2+10x+5+5y2+20y+20=x2+4y2+9−4xy−12y+6x⇒5x2+10x+5+5y2+20y+20=x2+4y2+9−4xy−12y+6x
4x2+y2+4xy+4x+32y+16=04x2+y2+4xy+4x+32y+16=0
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