Original: The real number a is called the real part of the complex number , and the real number b is the imaginary part/O. , Chapter P , p. 66 For example , 3 + 2i is a complex number , with real part 3 and imaginary part 2 .
Simplified: A complex number can now be written as a + bi ( or a + b cdot i ) , where a is called the real part of the number , and b is called the imaginary part .