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quadratic formula

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When the coefficients a,b, and c are complex numbers. Specifically, by completing the square on the left-hand side, derive the quadratic formula

z=(-b+(b^2-4*a*c)^1/2)/2*a where both square roots are to be considered when b^2-4*a*c cannot equal zero

Use the result to find the roots in the equation z^2 + 2*z+(1-i)=0.

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The quadratic formula is applied.

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