Algebra II: Plotting complex numbers on a 2D plane
This is a free lesson from our course in Algebra II
 
   
In this section you'll explore the concepts from plotting complex numbers in the complex plane. You will also find here some examples with solution, and the instructor explains all that with the help of audio, video presentation and in own hand writing. A complex number z can be expressed as:
          z = a + ib
where, a and b are real numbers and i = -1 is the imaginary unit.This complex number  z = a + ib,  can  be associated  with the ordered pair (a, b), and this is associated with the point whose x coordinate is a, and whose y coordinate is b. (More text below video...)
<h2> Plotting complex numbers on a 2D plane - Watch video (Algebra II)</h2> <p> video, AlgebraII, practice questions, quizzes, subject, math help, complex numbers, two dimensional plane, pure imaginaries, polar form, polar equation, example.</p> <p> When complex numbers plotted in the 2D plane. Pure imaginaries are plotted along the y axis and real numbers are plotted along the x axis.</p>
Other useful lessons:
Imaginary Unit
Adding and Subtracting Complex Numbers
Multiply and Divide the complex numbers
Classification of roots using the discriminant
Solving quadratic equation with imaginary roots
(Continued from above) This allows you to associate  every complex number with a point in the xy plane. Similarly, every point in the xy plane is associated with an ordered pair of numbers (a,b), and you can associate  this ordered pair with the complex number z = a + ib. Thus, every complex number is associated with a point in the xy plane, and every point in the xy plane is associated with a complex number. This allows you to represent every complex number as a point in the xy plane, and vice-versa. When you do this, you call the xy plane the complex plane. On this plane the real numbers are plotted along the horizontal axis (the axis of real) and pure imaginaries are plotted along the vertical axis (the axis of imaginaries). Other points in the plane must represent numbers that are part real and part imaginary i.e. complex numbers. E.g. To plot the point 3 + 2i (number made up of the real number 3 and the imaginary number 2i), measure along the real axis in a positive direction 3 units, turn through one right angle and measure 2 units up, parallel the imaginary axis as shown in figure below.
Complex number 1
The other way to represent complex number can be in the polar form. For example, plot the complex number zx+iy = r (cos + isin). Here r = (x2+y2), cos =x/r, sin =y/r and tan = y/x. It can be plotted as shown in figure below.
Complex number 2
A plane in which we represent a complex number geometrically is known as argand plane and points plotted on the argand plane is known as argand diagram.
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