Question

discriminant of -x^2 +1/2x+1/2=0 is
A.-1/2,1 B.1/2,1 C.-1/2.-1 D.1/2,-1/2​

Answer 1

Answer:

2x^2 - x-1=0

Discriminant =b^2 - 4ac=1+8=9

Answer 2

−x

2

+

2

1

x+

2

1

=0

a=1,b=

2

1

,c=

2

1

D=b

2

−4ac=(

2

1

)

2

−4(−1)(

2

1

)

=

4

1

+2=

4

1+8

=

4

9

∴ The diccriminant is

4

9

or

D

=

4

9

=±

2

3