Complex numbers are numbers that have both a real and an imaginary part. The imaginary part is a number that is multiplied by the imaginary unit $i$, which is defined as the square root of -1 ($i^2 = -1$). Complex numbers can be written in the form $a + bi$, where $a$ is the real part and $b$ is the imaginary part. Complex numbers can be used to solve a wide variety of problems in mathematics, physics, and engineering.
The TI-36 is a scientific calculator that can be used to perform a variety of operations on complex numbers. These operations include addition, subtraction, multiplication, division, and finding the square root. The TI-36 can also be used to convert complex numbers from rectangular form ($a + bi$) to polar form ($r e^{i\theta}$), and vice versa.
