Mathematicians frequently use the Greek alphabet.
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(x2 + 1) = (x2 - i2) with the factors (x+i)(x-i) where i is the square root of (-1).If you don't allow complex numbers (which is usually the case in school mathematics) then there is no factorisation.
For basic algebra, you can use a calculator with basic functions on it used for arithmetic. If you are trying to solve more complex equations, a scientific calculator will suit you better.
A Scientific calculator is a kind of calculator which is used to solve scientific, engineering and Mathematical problems. It comes loaded with commonly used functions such as logarithms, scientific notation, trigonometry, floating point, complex numbers, fractions and so on. It is used widely in solving quick mathematical problems such as trigonometry functions and some cases with physics and Chemistry.
The complex conjugate of 2-3i is 2+3i.
A complex problem I helped solve was when my friend was arguing with a girl .