The answer depends on the context, but bi is a variable, not a number. It could be the ith of a set of variables b1, b2, ... .
Or it could be the square root of -b2.
Or it could be a vector of magnitude b in the idirection.
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A number of the form (a + bi) is a complex number.
Complex
complex
"a + bi" is a common way to write a complex number. Here, "a" and "b" are real numbers.Another common way to write a complex number is in polar coordinates - basically specifying the distance from zero, and an angle.
So if you have a number z = a + bi. Then how to find 1 divided by z. The way to figure this is to get the denominator as a pure real number. Multiplying the numerator and the denominator by the complex conjugate {a - bi} will result in a pure real denominator.(a - bi)(a + bi) = a² + abi - abi - (bi)² = a² + b². So the multiplicative inverse is(a - bi)/(a² + b²)