[:.],[" questions 4."(ax+b)^(2)]

If the equation ax^(2) + by^(2) + (a + b - 4) xy - ax - by - 20 = 0 represents a circle , then its radius is

Solve the following equations: (ax)/(b)-(by)/(a)=a+b , ax-by=2ab.

Solve each of the following equatins : 4x^(2)-4ax+(a^(2)+b^(2))=0

Solve each of the following equatins : 4x^(2)-4ax+(a^(2)+b^(2))=0

Solve the following quadratic equation for x.x^(2)-4ax-b^(2)+4a^(2)=0

If the quadratic equation ax^(2) + 2cx + b = 0 and ax^(2) + 2x + c = 0 ( b != c ) have a common root then a + 4b + 4c is equal to

If the quadratic equation ax^(2)+2cx+b=0 and ax^(2)+2bx+c=0(b!=c) have a common root,then a+4b+4c=