Question

For what value of k for which the quadratic equation 2x^2+ kx-8=0 has real roots

Answer 1

from
$ax {}^{2} + bx + c = 0$
a=2 ,b=k ,c= -8

b square = 4ac
k square = 4×2×(-8)
k square = - 64
k=root - 64
k = -8