Question

if D is greater than 0, then roots of a quadratic equation ax^2+bx+c=0 are?

Answer 1

real and distinct......

Answer 2

roots of ax^2+bx+c=0 are

[b+(b^2-4ac)^1/2]/2a and [b-(b^2-4ac)^1/2]/2a

and now if there is said that the root cannot be -ve  then choose the first equation.