# HSN-CN.C

Use complex numbers in polynomial identities and equations.

## Standards

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.