The greek letter iota, i, represents the square root of -1 we call i an imaginary unit. any number that is a product of a real number and the imaginary unit i is called an imaginary number. complex numbers are numbers that consist of a real part and an imaginary part. they are generally expressed as a + bi. in this task, you will find a pattern relating to the powers of i and also discover some identities involving complex numbers. use the identity i2 = -1 to compute the powers of i and complete the table.