a + bi. a & b are both real numbers. the number i is the imaginary unit equal to the positive square root of -1.
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Standard form
There are many different standard forms: standard forms of numbers, of linear equations, of circles, etc. The standard form of numbers simplifies working with very large and very small numbers.
Yes, the complex numbers, as well as the real numbers which are a subset of the complex numbers, form groups under addition.
Complex numbers are numbers of the form (x + yi) where x and y are real numbers and i is the imaginary square root of -1. Any collection of such numbers is a set of complex numbers.
Those are both 'complex' numbers. Together, they are a pair of complex conjugates.