Question

What are the values of k for which the quadratic
equation 21x2 - kx+k=0 has equal roots?​

Answer 1

Answer:

0 or 84

Step-by-step explanation:

If roots are equal; D=0

=> ✓b^2-4*a*c = 0

b^2 = 4*a*c

k^2=4*21*k

=>k(k-84)=0

=> k=0 or k=84