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Use complex numbers in polynomial identities and equations.


HSN‑CN.C.7 Solve quadratic equations with real coefficients that have complex solutions.
HSN‑CN.C.8 $(+)$Extend polynomial identities to the complex numbers. For example, rewrite $x^2 + 4$ as $(x +...
HSN‑CN.C.9 $(+)$Know the Fundamental Theorem of Algebra; show that it is true for quadratic polynomials.