Question

F the quadratic polynomial 9x2+8kx+8 has equal zero then the value of k is

Answer 1

if a quadratic equation has equal zeros then D=0

Answer 2

if the roots are equal
then

2a=-8k/9
a^2 = 8/9

a= 2*2^(1/2)/3

4*2^(1/2)/3 = -8k/9

2^(1/2) = -2k/3
k=-(3/2)* 2^(1/2)