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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

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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
User Mrunal Gosar
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