Question

if 1/2 is a root of x²+kx-5/4=0 then-find k

Answer 1

(1/2)2+1/2k-5/4=0
1/4+1/2k-5/4=0
1/2k-1=0
1/2k=1
k=2

Answer 2

given,
x=1/2
then,we know that,
k=2