# HSN-CN.A.1

Know there is a complex number $i$ such that $i^2 = -1$, and every complex number has the form $a + bi$ with $a$ and $b$ real.

## Tasks

Complex number patterns

Vertex of a parabola with complex roots

Know there is a complex number $i$ such that $i^2 = -1$, and every complex number has the form $a + bi$ with $a$ and $b$ real.

Complex number patterns

Vertex of a parabola with complex roots