2 What is a complex number? A complex number is made up of a real number and an imaginary number. The standard form is a+bi where a is the real term and bi is the imaginary term.
3 Powers of i i = i2 = i3 = i4 = √-1 i i = √-1 √-1 = -1
4 Practice Simplify i5 = i6 = i7 = i8 = Any power of i that is a multiple of 4 is also one. We can find any power of i by writing it as the product of the highest power that is a multiple of 4 and i, i2, and i3.