https://es-cl.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:complex 2025-11-20T17:56:31.732617198Z Complex numbers Welcome to the world of imaginary and complex numbers. We'll learn what imaginary and complex numbers are, how to perform arithmetic operations with them, represent them graphically on the complex plane, and apply these concepts to solve quadratic equations in new ways. unit