Complex Numbers Definition: A complex number is a number consisting of a real and imaginary part. Complex numbers are plotted on the complex plane, on which the real part is on the horizontal axis, and the imaginary part on the vertical axis. Two complex numbers are said to be equal if and only if their real parts are equal and their imaginary parts are equal.
Complex multiplication is a more difficult operation to understand from either an algebraic or a geometric point of view. Multiplying complex numbers is accomplished in a manner similar to multiplying two binomials. You can use the FOIL process of multiplication, the distributive property, or your personal favorite means of multiplying.
The conjugate of a complex number a + bi is the complex numbers a - bi.
For example, the conjugate of 4 + 2i is 4 - 2i.
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