Question

Ifax^2+bx+c=0(a,c!=0,b,c belongs to R) then x equals to ?​

Answer 1

For the equation to have equal roots, the discriminant must be equal to zero.

D= b  

2

−4ac=0

⇒ b  

2

=4ac

⇒ c=  

4a

b  

2

 

​  

 

∴ Option D is correct.