(l+m)^(2)-4lm

Factories: (l +m)^(2) - 4 lm

The perfect square form of the quadratic equation lx^(2)+mx+n=0(l""ne0) is (x+(m)/(2l))^(2)=(m^(2)+4lm)/(4l^(2))

If l and m are variable real number such that 5l^(2)+6m^(2)-4lm+3l=0 , then the variable line lx+my=1 always touches a fixed parabola, whose axes is parallel to the x-axis. The directrix of the parabola is

If l and m are variable real number such that 5l^(2)+6m^(2)-4lm+3l=0 , then the variable line lx+my=1 always touches a fixed parabola, whose axes is parallel to the x-axis. The directrix of the parabola is

If l and m are variable real number such that 5l^(2)+6m^(2)-4lm+3l=0 , then the variable line lx+my=1 always touches a fixed parabola, whose axes is parallel to the x-axis. Then find the vertex of the parabola is

If l and m are variable real number such that 5l^(2)+6m^(2)-4lm+3l=0 , then the variable line lx+my=1 always touches a fixed parabola, whose axes is parallel to the x-axis. The focus of the parabola is

The line lx+my+n=0 intersects the curve ax^(2)+2hxy+by^(2)=1 at the point P and Q. The circle on PQ as diameter passes through the origin.Then n^(2)(a+b) equals (A) l^(2)+m^(2)(B)2lm(C)l^(2)-m^(2)(D)4lm

8l^(3)-36l^(2)m+54lm^(2)-27m^(3)