Question

The discriminant of 3x² +4x-a is one . Then the value of a is​

Answer 1

Answer:

Correct option is

D

28

Quadratic equation: 3x

2

−4x−1=0

Comparing the given equation with ax

2

+bx+c=0

we have a=3,b=−4,c=−1

Now, discriminant

D=b

2

−4ac

=(−4)

2

−4(3)(−1)

=16+12

=28.

Answer 2

Answer:

the given eqn is compare with ax2 + bx + c = 0 , we get ..

therefore a= 3 ,b= 4 , c= -a.

b2- 4ac = (4)² - 4× 3×- a

= 16 + 12a

= 28a .

therefore the value of discriminant is 28a .