Question

a complex number is represented in the form a + bi, where a and b are real numbers, and i is the.
the subtraction of complex numbers is not, meaning the order in which the numbers are subtracted affects the outcome.
in a complex number a + bi, a is the term.
the geometric representation of complex numbers takes place in the plane.
when the imaginary parts of two complex numbers cancel each other out, the result is described as purely.

Explanation:

1. In the form $a + bi$ of a complex - number, $i$ is the imaginary unit with the property $i^2=-1$.
2. Subtraction of complex numbers is non - commutative. For example, if $z_1=a + bi$ and $z_2=c+di$, then $z_1 - z_2=(a - c)+(b - d)i$ and $z_2 - z_1=(c - a)+(d - b)i$, which are different.
3. In $a + bi$, $a$ is the real part.
4. Complex numbers are represented geometrically in the complex plane (also known as the Argand plane), where the real part is plotted on the x - axis and the imaginary part on the y - axis.
5. When the imaginary parts of two complex numbers cancel each other out during addition or subtraction, the result is a real number.

Answer:

1. Imaginary unit
2. Commutative
3. Real
4. Complex (or Argand)
5. Real