# 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.