If `4a^(2)+9b^(2)-c^(2)-12ab=0` then family of straight lines `ax+by+c=0` are concurrent at `P` and `Q` then values of P & Q are

If a^2+b^2-c^2-2ab = 0 , then the family of straight lines ax + by + c = 0

If a^(2)+9b^(2)-4c^(2)=6ab, then the family of lines ax+by+c=0 are concurrent at:

If 16a^(2)+25b^(2)-c^(2)=40ab, then the family of lines ax+by+c=0 is concurrent at the point(s)

If 4a^(2)+9b^(2)-c^(2)+12ab=0 then the family of straight lines ax+by+c=0 is concurrent at : (A)(-3,2) or (2,3)(B)(-2,3) or (2,-3)(C)(3,2) or (-3,-2)(D)(2,3) or (-2,-3)

If 25a^2 + 16b^2 – 40ab – c^2 = 0 , then the family of straight line 2ax + by + c = 0 is concurrent at

2a+b+2c=0(a,b,c in R), then the family of lines ax+by+c=0 is concurrent at

If 6a^(2)+12b^(2)+2c^(2)+17ab-10bc-7ac=0 then all the lines represented by ax+by+c=0 are concurrent at the point

If 3a-2b+5c=0. then family of straight lines ax+by+c=0 are always concurrent at a point whose co-ordinates is (alpha,beta), then the values of 5(alpha-beta)