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determine all values of K for which the roots of the equation x squared minus 8x + k equal 0 are complex

Respuesta :

x^2 - 8x + k = 0
for the roots to be complex the discriminant b^2 - 4ac is <  0

(-8)^2 - 4*1*k < 0
-4k < - 64
k >  16

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