Quadratic formula and complex numbers
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1. When solving a quadratic equation using the quadratic formula, it is possible for the b2 - 4ac term inside the square root (the discriminant) to be negative, thus forcing us to take the square root of a negative number. The solutions to the equation will then be complex numbers (i.e., involve the imaginary unit i).
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Solution Summary
This provides an explanation of the quadratic formula in regards to complex numbers.
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