a + bi
a is the real part
bi is the imaginary
Wow, I'll bet OP is REALLY confused now!
You can't take the square root of a REAL number. Thank you potato salad!
From Mr. Fantastic's post:
The imaginary part is b. The i does not get included. The imaginary part is the coefficient of i.
The definition of an imaginary number is a number when squared gives a negative result.
"i" is a symbol with the property that
The "real" part of the complex number = the real number "4" AND the imaginary part of the complex number is the real number
How's that sound?