Question

if 2 is a root of the quadratic equation 2x²+Kx +1=0,. then the value of k is​

Answer 1

2×(2)^2+k(2)+1=0

2×4+2k+1=0

8+2k+1=0

2k+9=0

2k=0-9

2k=-9

k=-9/2