If one root of `z^2 + (a + i)z+ b +ic =0` is real, where `a, b, c in R` , then `c^2 + b-ac=`

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If one root of `z^2 + (a + i)z+ b +ic =0` is real, where `a, b, c in R` , then `c^2 + b-ac=`

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