Question

3. For what value of k, the quadratic equation 5x2 – kx + 4 has equal roots.

Answer 1

Answer:

k=±√80=±4√5

Step-by-step explanation:

5x² – kx + 4 =0

here

a=5,b=-k c=4

Roots are equal if

b²=4ac

(-k)²=4*5*4

k²=80

k=±√80=±4√5