Question

find the value of k for the following quadratic equation so that it has two real and equal root 5 x ^2- 2 k x + 20 =0​

Answer 1

Answer:

Quadratic equation:

5x

2

−2kx+20=0

It is given that the roots of the quadratic equation are real and equal, Then discriminant D=0.

Comparing the given equation with ax

2

+bx+c=0

we have a=5,b=−2k and c=20

Now, D=0

∴b

2

−4ac=0

∴(−2k)

2

−4(5)(20)=0

∴4k

2

−400=0

∴k

2

=100

∴k=±10

Thus, k=10 or −10.

Answer 2

Step-by-step explanation:

here is your answer........