Question

`11-x=2x^2`

Answer 1

`⇒2x^2+x-1=0` 

Here, 

`a=2,` 

`b=1` 

`c=-1`  

Discriminant D is given by: 

`D=b^2-4ac` 

=`1^2-4xx2(-1)` 

=`1+8` 

=`9`