Complex Numbers

Yes, if you have an equation az^2 + bz + c = 0 where a, b, and c are complex numbers, you can use the quadratic formula to find the (usually two) possible complex values for z. However, they will usually not be conjugates of each other.

Some context would be helpful in answering this question, but the most usual meaning would be, a predetermined number, for example, there is a set number of people who can play a game of football.

two numbers, one for real part, one for imaginary part, then you have to redefine +,*,/ and so on

Although the magnitude of 12 times a complex number will be greater than 5 times the same complex number, complex numbers are not ordered in the same way that ordinary numbers are. So you cannot compare 12*(x+iy) and 5*(x+iy).

I thought it was real... square of -x is the same as the square of +x

Try reading a tape measure without them

Infinity

This question is kind of vague.

Many of your everyday situations use the rational numbers (fractions and integers), which are a subset of real numbers.

If you do anything with angles (like surveying, or navigation) then irrational (which are still real) come into play.

There are situations when it's necessary to consider complex (a combination of real and imaginary) numbers. When dealing with waves or periodic motion, imaginary numbers become an important thing to consider.

Roughly, 3 * 108 metres per second

It is: (100/40)*82 = 205 and 40% of 205 is 82

There is no single function. In fact there are infinitely many possible functions.

25

2.9886

when you multiply it with another polynomial

I don't think there is such a thing. There is a "Golgi complex", also known as the "Golgi apparatus", but it is not related to numbers.

The properties of an array or group or complex numbers form a system of real

and imanginary numbers that are at a 90 degree angle to each other. Refer to

the Related Link and notice that in both panes, the lines are at 90 degrees.

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The numbers are not separately identified in the question.

An Argand Diagram is a graphical representation of a complex number. The real part is the horizontal coordinate, and the imaginary part is the vertical coordinate.

See Related Link at Wolfram MathWorld.

yes it does

3 and 5 are both complex numbers, and if you multiply them together, you get 15, which is a real number.

If you were looking for two non-real complex numbers, then any pair of complex conjugates will work. For example, 5+2i times 5-2i is 29.

-1

A big cab. That one works, with numbers 1, 2, 9, 7, 3, 1, 2.

There are likely quite a few more, that's just one I found.