If 2/ 1!9! + 2/ 3!7! + 1/5!5! =2^m /n! Then orthocentre of the triangle having sides x-y+1=0, x+y+3=0, and 2x+5y-2=0 is:

a) 2m-2n, m-n

b) 2m-2n, n-m

C) 2m-n, m+n

D) 2m-n, m-n

show that the centroids of the triangles of which three perpendiculars lie along the lines y=m1x,y=m2x,y=m3x lie on y(3+m2m3+m3m2+m1m2)=x(m1+m2+m3+3m1m2m3)

show that the equation (ab-h²)(ax²+2hxy+by²+2gx+2fy)+af²+bg²-2fgh=0 represent a pair of straight lines and that these straight lines form a rhombus with the lines ax²+2hxy+by²=0

A circle has its center on straight line 5x-2y+1=0 and cuts the x axis at two points whose absciasse are -5,3 find equation of the circle and it's radius. 

 

Prove that ax^2+by^2+cz^2 +2ux+2vy+2wz+d=0 represent a cone if u^2/a+v^/b+w^2/c=d