High School · The Complex Number System

CCSS.MATH.CONTENT.HSN.CN.A.1

Know there is a complex number i such that i² = -1, and every complex number has the form a + bi with a and b real.

Read this standard on the official Common Core site

Lessons that teach this standard

• Complex Numbers: Arithmetic with i

  Why mathematicians introduced i with i² = −1, how to add, subtract and multiply complex numbers, how the powers of i cycle, and how the conjugate makes division possible.