3.3 Quadratics with complex solutions
Unit 3 · Complex numbers
Ideas in this lesson
Square roots of negative numbers
For positive k, √(−k) = i√k using the principal square root.
Nonreal quadratic solutions
Complete the square or use the formula; a negative discriminant introduces i.
Conjugate roots of real quadratics
If a real-coefficient quadratic has a nonreal root, its other root is the conjugate.
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