Question

if the discrminant of the equation 2x2_kx_4=0is64then findk

Answer 1

Answer:

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Step-by-step explanation:

k2 - 32 is the discriminant

Answer 2

Given equation :

$2x^2-kx-4=0\\\\a=2\\\\b=-k\\\\c=-4\\\\D=b^2-4ac$

Given that discriminant is 64 .

$64=(-k)^2-4*2*-4\\\\64=k^2+32\\\\k^2=64-32\\\\k^2=32$

k = ± 4√2